Halo 3 and Reach (best one) and soon H4.
Gears 1-3
GTAV
BF4
CoD 2, 4, and WoW.
I'd pick up Black Ops 1 again. Best CoD experience I had.
Id pick up Far Cry 3 again too. Amazing single and multiplayer. Free DLC do to user created content. Balanced gameplay. That game was fucking perfect. And I still need to play Blood Dragon.

I'm always buying new games, so if somebody has been wanting a battle buddy for something, let me know and I'll pick it up.