(In no particular order)
CS
BF:1942
C (Not so much since Vietnam has come out)
BF:V
UT2004
The Depression Game (This game sucks btw.)
Roller Coaster Tycoon
Starcraft (rarely)
I want to start playing FFX-2, Suikoden III, and XenoSaga, and I would like to pick up KoToR as well.