Ghost Recon
Rainbow Six 3
Counter-Strike
Return to Castle Wolfenstein
Unreal
I am heavily leaning towards R63, with Ghost Recon a close second (partly because it's only $19 used). Having already played Counter-Strike a lot on PC, I would only purchase it if the other titles mentioned simply aren't that good, but I can't imagine that being true. Anyway, just give me some opinions on how these games are.

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