Swat4 looks intense, I currently have:

World of Warcraft (collectors box set)
Delta Force Xtreme (delivered next saturday)
Counter-Strike 1.6
Counter-Strike Source
Condition-Zero
Day of Defeat
Return to Castle Wolfenstein
Unreal Tournament 2004

I have a few others, but these are the ones I've hammered in the past. That reminds me to re-install world of warcraft