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I might have to agree with the point on dreadnaughts, Although from what I've read (And heard), they can be quite usefull at times, (I mean, blood fury... X2 Attacks? Thats like... 6 attacks, Not to mention they can be upgraded fairly well.)
I went to my local hobby Shop recently, and a guy recommended I get a few Defilers (By recommended, I mean Ordered me. Luckily, I ran away 3D6" before he could roll for pinning... I gotta stop reading my rulebook >.>)
Anyways, Like I was saying, I'm not too sure what Niche I wanna fill. I mean, I've got some good infantry going (2 Squads of CSM'S and a squad of Beserkers), But I havent played many games, So I'm not too sure what My playing style would really be. I just want a good, All around Vehicle that can take (As well as deal out) Damage.

So You're suggesting Defilers? Okay, I'll look into it.

P.S - My Army List (Slightly Modified - I'm still changing and adding things.), is Here, halfway through the page. Just CTRL-F my name or somethin.

ok, well 1750 point Alpha Legion List
all of the models that can have mark of undivided, do have it

Lieutenant - 140
MC Power Weapon, Strength, Resilience, Terminator Armor, Spikies

Chosen Squad - 6 man - 310
terminator armor, 2 reapers, powerfists, tank hunters

Obliterators - max squad - 210

Chaos Marines - 6 man - 150
2 plasmas, aspiring champ - powerfist, infiltrate, move through cover

Chaos Marines - 6 man - 150
2 plasmas, aspiring champ - powerfist, infiltrate, move through cover

Chaos Marines - 6 man - 150
2 plasmas, aspiring champ - powerfist, infiltrate, move through cover

Havocs - 6 man - 184
some combination of heavy bolters and plasmaguns, still haven't decided
aspiring champ - powerfist, infiltrate

Havocs - 7 man - 241
4 autocannons, aspiring champ - powerfist, infiltrate, tank hunters

Defiler - 215
Indirect, Parasitic Posession

Defiler for mob control, hiding behind a rock or something
termies + lord and oblits advance, shooting at vehicles and troops

CSM squads infiltrate to places where there are 'high' save models

havocs infiltrate to where they can take out priority targets, autocannons for vehicles and the other one for infantry or heavy infantry, depending on what I end up giving them

neutral yeah,
A don't have demons
B don't have the models for cultists yet
C not going to get demons until the new codex comes out

hmm, I may end up changing the plasma/heavy bolter squad to have some lascannons/missile launchers instead then
thanks mrgreen
Edit: again

whoopsies, miscalculated points xp
the list is essentially the same, only the new one has the havocs with autocannons and then the other having 3 lascannons and a missile launcher

I believe the better stealth army though are the Night Lords. Night vision obviously doesnt aid in stealth but seems rather fitting in a fluffy way, add on infiltrate, their own skill stealth adept, and then move through cover, and you have ninja marines.

Mechanised Steel Legion

Doctrines:
Mechanised
Close Order Drill
Grenadiers
Hardened Fighters
Sharpshooters

HQ

Senior officer-bolt pistol, power fist, carapace armor, refraction field, medallion crimson.-----111
Veteran-medic-----11
Veteran-Standard bearer-----11
Guardsmen-Meltagun-----10
Hardened Fighters-----15

Elite

Nadda neutral

Troops

Platoon HQ
Junior officer-bolt pistol, power weapon-----46
Veteran-medic-----11
Guardsman-Meltagun-----10
Guardsman-flamer-----6
Sharpshooters & Hardened Fighters-----25

Squad 1
Sergeant-Las pistol, close combat weapon-----0
9 guardsmen-1 meltagun, 1 missile launcher crew-----25
Sharpshooters & Hardened Fighters-----25

Squad 2
Sergeant-Las pistol, close combat weapon-----0
9 guardsmen-1 meltagun, 1 missile launcher crew-----25
Sharpshooters & Hardened Fighters-----25

Veteran Storm Trooper Sergeant-Las pistol, power weapon-----21
9 storm troopers-2 flamers-----102

Veteran Storm Trooper Sergeant-Las pistol, power weapon-----21
9 storm troopers-2 flamers-----102

Veteran Storm Trooper Sergeant-Las pistol, power weapon-----21
9 storm troopers-2 meltaguns-----110

Fast Attack

3 Sentinels-3 autocannons-----150

3 Sentinels-3 autocannons-----150

Heavy support

Leman Russ Battle Tank-Hull mounted Heavy Bolter, Heavy bolter sponsons, and smoke launcher-----158

Transports

7 Chimeras-Heavy bolter turret, hull mounted heavy flamer, smoke launchers-----616

All in all, 1807pts.

Basic attack plan: Vehicles soften up enemy infantry, and when my own guys hop out, (hopefully flanking the enemy), they deal with the heavy stuff while mopping up the infantry. Sentinels harass from afar, and Leman russ just aims for the problem troopers.

This is my first draft of the army, and I have to say, I'm not too impressed with it. Lord knows the chimeras take a big portion of the points, and I can only hope most of them actually get to the target... Although this is more of an objective claiming army, I doubt it will do well in a standard kill-fest. Any tips for MI? (mobile infantry)

Hq is pretty solid not much I would change at this point but as you get further into the game you may find some other things you like

Troops: Grenadiers are a solid choice here as your army is pretty small. But should you move up to the 2000 points range I sugest either picking up a Armoured Fist squad or another Platoon and running the stormtroopers as elites.

Fast Attack: Here i would give one squad of sentinals 2 Lascannons and 1 Auto and the other, 2 Auto 1 las this will make them both able to bring down large vechiles with one more effective at hunting troops. Also its always good to shoot lascannons at termies. Bonus is that the Lascannon Sentinal is the Armageddon pattern and fits fluffwise

Heavy: Not a big fan of smoke cause if your smokin your not shootin. And for a ordanance weapon you should always be shooting

Transports: Put some multilasers up there in those turret and you'll be good. All I would put more Heavy Bolter than Heavy Flamers in the hulls. I just dont see Flamer used much and ive had imboilized vechile with only the heavy bolter knock out whole squad while my opponent forgot they were there.

Also another thing to think of when you move up in point is Pintle mounted Weapons im a huge fan of the heavy stubber. But each has it own uses.

13th Co. Space Wolves from the Eye of Terror Codex.

My lists for 500, 1000 and 1500 pts.

500pts:
Ymir Heimdall Baneghost: Wolf Lord
With; Lightning Claws, Runic Armour, Belt of Russ, Wolf Tail Talisman, Wolf Pelt, Frag Grenades, Krak Grenades and Mark of the Wulfen
Total; 187
Kit allows on a good charge 9 power weapon attacks. Also 2+ amr. and 4+ inv.

Grey Slayers Pack 1: 1 Wolf Guard and 5 Grey Slayers
Bolter and Close Combat Weapon + Frag and Krak Grenades. (standard kit) 1 Melta. Wolf Totem.
Total; 166

Grey Slayers Pack 2: 1 Wolf Guard and 5 Grey Slayers
Bolter and Close Combat Weapon + Frag and Krak Grenades. (standard kit) 1 Melta.
Total; 146

1000 pts.

Ymir Heimdall Baneghost + Gungnir; Wolf Lord + Fenrisian Wolf
With; Lightning Claws, Bionics, Runic Armour, Belt of Russ, Wolf Tail Talisman, Frag Grenades, Meltabombs and Mark of the Wulfen
Total: 209
Kit allows on a good charge 9 power weapon attacks. Also 2+ amr. and 4+ inv.

Huginn Vn Muninn Stormhowler; Rune Priest
Physic Power; The Gate With Tzeentch's Bane (Rune Weapon), Storm Bolter, Chooser of the Slain, Runic Charm, Terminator Armour, Wolf Tail Talisman and Mark of the Wolfen
Total: 196

Bor Vili Lightningpaw's Pack; 7 Grey Slayers + 1 Wolf Guard
Bolter and Close Combat Weapon + Frag and Krak Grenades (standard kit) and 2x Meltas . Bor has; Plasma Pistol, Power Fist and Mark of the Wulfen. Svadilfari Rig Longstanding has; Wolf Totem.
Total: 263

Kvasir Logi Trollfist's Pack; 6 Grey Slayers + Wolf Grd
Bolter and Close Combat Weapon + Frag and Krak Grenades. Plasma Gun. Kvasir has; Plasma Pistol, Power fist and Mark of the Wulfen.
Total:212

Hermod Gundrun Firedriver's Pack; 2 Long Fangs + Wolf Guard
Missile Laucher x2. Hermod has; Bolter, Runic Charm and Auspex.
Total: 120

1500 pts.

Ymir Heimdall Baneghost + Gungnir; Wolf Lord + Fenrisian Wolf
With; Lightning Claws [Master Crafted], Bionics, Runic Armour, Belt of Russ and Mark of the Wulfen
Total:217
Kit allows on a good charge 9 power weapon attacks with rerolls. Also 2+ amr. and 4+ inv.

Huginn Vn Muninn Stormhowler; Rune Priest
Physic Power; The Gate With; Tzeentch's Bane (Ruinic Staff) [Master Crafted], Storm Bolter, Frag Grenades, Chooser of the Slain, Runic Charm, Terminator Armour, Wolf Tail Talisman and Mark of the Wolfen
Total; 197

Mjollnir Vidar Thunderwolf's Pack; 5 Storm Claws + 1 Wolf Guard
Bolt Pistol and Close Combat Weapon + Frag and Krak Grenades (standard kit). x2 Power Weapons. Mjollnir has; Plasma Pistol, Thunder Hammer, Bionics, Runic Charm, Wolf Tail Tailsman, Mark of the Wulfen.
Total; 217

Bor Vili Lightningpaw's Pack; 5 Grey Slayers + 1 Wolf Guard
Bolter and Close Combat Weapon + Frag and Krak Grenades (standard kit). 2x Melta Guns, Auspex . Bor has; Plasma Pistol, Power Fist, Wolf Tail Talisman, Melta Bombs and Mark of the Wulfen. Svadilfari Rig Longstanding has ; Wolf Totem.
Total; 229

Kvasir Logi Trollfist's Pack; 5 Grey Slayers + Wolf Guard
Bolter and Close Combat Weapon + and Frag and Krak Grenades (standard kit). x2 Plasma Guns, Auspex. Kvasir has; Plasma Pistol, Power fist, Wolf Tail Talisman and Mark of the Wulfen.
Total; 204

Skoll's Wolf Pack; Fenrisian Wolf Pack
Total; 90

Ragnarok Hati Windhowler's Pack ; 2 Storm Claws Bikers + 1 Wolf Guard
Twin-Linked Bolters and Close Combat Weapon + Frag, Krak Grenades. 1 Power Weapon. Ragnarok has; Lightning Claw and Mark of the Wulfen
Total; 163

Hermod Gundrun Firedriver's Pack; 3 Long Fangs + Wolf Guard
Missile Laucher, Lascannon and Plasma Cannon. Hermod has; Bolter, Auspex
Total; 183

In all the tactics are to move forward to engage in combat quickly. At the same time faster units e.g. Wolves and Bikers flank the enemy. Providing fire power from behind and removing any tough tanks are the long fangs. The grey slayers march forward shooting and assulting where possiable. The Rune Priest uses the gate to teleport forward taking the storm calwsto the toughest and hardest area of fighting. The wolf lord goes where ever is needed.