I lost my old PC. It was able to run TF2, Civ IV, and that was about it at the end of its life. I just got this upgrade after moving home - loving it.
If you need any old gen suggestions, I've got a ton. ;) Bioshocks, Viva Pinata, Dead Rising, Dead Island, Mass Effect, Fallout, Skyrim, Oblivion, etc. etc.