Battlefield 1942. I'm a Desert Combat addict, and I also love Forgotten Hope. Moreover, I still like a game of Vanilla BF (original BF1942) from time to time .
The Half Life franchise was the best bit of games and mods made to date. Half Life 2 and it's Source Engine is the best made to date. Half Life 2 is the best game ever made.
I Picked Half-Life 2, although I mainly play CS: Source. I also play Battlefield: Vietnam, and soon to get BF1942 from a friend to play ForgottenHope.
Just installed HL2 last night. Awesome game, even if I do have it on lowest detail and it still runs @ like.. 10fps