SaffireNinja
Zero the Crimson
I've watched quite a bit of the series (at least the ones aired on TV, in the US.) And I've played Zoids Assault (XBox 360) and Zoids Battle Legends (Game Cube) Both rather interesting, though the latter of the two is my favorite.
As for favorite Zoids:
The Geno Breaker and Liger Zero Schneider
What! They had a game for the 360?! It's official, I'm starting online shopping!
You can find it at Game Stop for around $10.
It isn't very Zoids like. It has a more dark military type look to it and plays like a Fire Emblem game.
There are actually a lot of down points to this one, if you focus on the fact that it's a Zoids title.