Games to play when that PC gets glued together!

My computer is from 2004. It has a 128mb PCI card. It has a Pentium 4 3.0ghz HyperThread CPU. It has a 17in 4:3 monitor.

The most recent game I'm able to play is Half Life 2 on low settings. I can't even bother playing my bread and butter genre, RTS, because the card can't handle that many units at once.

So this is a list concerning games I have to buy/play/replay/download when I build my beauty. Some of them I already own, and I'll replay'em with all the bells and whistles turned on, because I've basically given up on playing anything beyond Minesweeper on it.