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Actually, the minimun Terminator amount would be 3 for your Grand Master's Retinue. I would suggest more though, trust me he is a fire magnet. Although, once you get him in the assualt you will rarely find an opponent that will best him, remember...especially when fighting marines, your Grey Knights all get Nemesis Force Weapons (Strength 6) and a 5 WS, those will up your statistics to where alone can win you battles.
Plus, as another hint never forget the shrouding, it can really throw your opponents off, especially with your foot-slogging troops.
Also, I would suggest 2 squads of Inquisitorial Stormtroopers, they fit in well with Grey Knights because, no matter what, your opponent will do anything in his power to slay these warriors of the emperor before they can get into assualt, being the most powerful, but unfortunately expensive, army in the game, your opponent will instantly lock on to them leaving your Inquisitorial Stormtroopers alone where you can make great use of thier Special Weapon options. The melta gun is great for tankbusting, you can get in there silently for most of your opponents fire will be distracted, and one tank I can almost guarntee you will make up thier points very quickly. Thier very versitle...but I wouldn't bring to many of them.
Also, don't overestimate psycannon, although powerful and great in it's many uses, they are a bit over expensive and can sometimes not be neccasary...your stormbolter will often get the job done so...stick to that if points are close.
Anyway, more info later...hope this helps for now.

Well, although I highly look down upon Radical Inquisitors, if your going to use one use them for thier only good use. stare
I would say bring a DaemonHost, these people are unbelievable cheap for only 85points. Eh, this is off the top of my head so don't quote me, but I believe thier statline goes a little like this.

WS:4 BS:4 S:6 T:4 W:4 A biggrin 6 Ld:9 Sv: 4*
^^Again, I'm not 100% sure on that, I could Pm you stats later from my codex if you need them.

They also have some pretty mean psychic powers that they get to roll for at the start of every turn...one addint D3 to both Strenght and Toughness... stare
Also, I'm almost sure they have another one that doubles thier movement and assault range, and doubles thier attacks. Eh, 13 attacks. I hate Warp Spawn. stare

My army list, yes unfortunantly that was previously stated if you don't mind looking back. Although I have added some Grey Knight additions since then if your interested.

Grey Knights x 15
Inquisitor Coteaz (retuine)
Eversor Assasin
Vindicar Assasin
Sisters Of Battle squad.

And as for "style" being a heavy Grey Knight army, naturally I can do both. I don't know if your aware or not, but Grey Knights excel in Close-Combat more so than their Brother Marines, however they can definantly lay down a lot of fire. Unfortunatley, the only thing my "style" really does lack is Heavy and peircing fire, very annoying at the right times.

As for specifics, that is just an outline if that, if your friends have any questions on how to field certian units or anything of that sort, I'd be happy to lend you my advice.

Yes, that is correct you may only bring one Assassin and deciding which one you choose really depends on the whole smear. Your opponent, what their fielding, the mission especially, and sometimes even what kind of mood your feeling in. The inconvinience of it all is that an Inquisitor must be present to feild them, plus you'll realise from use that most of them really have a hard time making up their points, however when used correctly they can definately dent enemy plans.

So, for any advice your friends want I'm here. I mean, I'm pretty sure there are a couple other DaemonHunter players here with some advice of their own as well. (By the way, are any of your friends playing a radical army?)

woot

[reply] of course i wouldnt send her in alone i would have other assassins with her and if possible my terminators

Hm, I thought so. My friend has a.... I forgot. The sniper/assassin. Anyway, I have no doubt he'll use him to his fullest. Although, against Tau, range doesn't mean much....
Yeah, I'll ask if they have questions. I don't know if they play radical yet, simply because they don't have large forces. One of them has a group of Grey Knights, the Sniper, and the Inquisitor. And I generally can take them down when we play points.