I would either choose Resistance 2 or Call Of Duty-World At War. These games both had fantastic graphics and the game play along with the story line were breath taking.
I bought The Elder Scrolls IV: Oblivion: Game of the Year Edition for about $20 the other day so I have to choose that.
I recently go Need for Speed Most wanted on the pc and it isn't better than the 360 version, but that game is fun no matter where you play it. You could make that game on Atari and I would still play that game. Love it!!
Counterstrike is the best game, pay no attention to the others, "they know not of which they speak". What movie is that from? The bible or something, all i know is its way old.