Hitman 2: Silent Assassin
Warlords Battlecry III
Will Rock
Defcon
Civilization 3
Knights of the Old Republic
Knights of the Old Republic II
Grim Fandango
The Sims + expansions
The Sims 2
Prince of Persia: The Sands of Time
Diablo 2 (and expansion)
Turok
Turok 2
Fallout
Fallout 2
System Shock 2
Grid Wars
Age of Empires
Age of Empires 3
Battlefield 1942
Battlefield 2142
Company of Heroes
Call of Cthulhu: Dark Corners of the Earth
Ghost Recon Advanced Warfighter
Mafia
Scarface
Democracy
Final Fantasy VIII
S.T.A.L.K.E.R: Shadow of Chernobyl
Desperate Housewives
Supreme Commander
JFK Reloaded
Soldat
Operation Flashpoint
Armed Assault
Soldier of Fortune 2
Planescape Torment
Quake
Quake 2
Quake 3
Quake 3 Team Arena
Black & White 2
Halflife
Halflife 2
Halflife 2: Episode One

Will most likely purchase Counterstrike Source + mods.