Knotdead Yett

Seeing how I only got MW2, BF:BC2, Killzone 2 and Assassin Creed 1. I been trying find a good game to play online besides FPS like the ones listed above. Want something a somewhat different pace.

Here are some that I thought:
Metal Gear Solid 4 (heard it was online and good)
Aliens vs. Predator
Tranformers: War for Cybertron
Mag
SoulCalibur IV
Street Fighter IV

And probably not geting CoD4 or WaW, going to wait for Black Ops or MoH.

Willing to take any input, and tell me why (curious why you like the online play). And thanks in advance.