Help me buy a new computer

[LondonBroil]

Currently:
2.0GHz, 512MB SDRAM, 40GB HDD, GeForce 3 Ti 200, Windows 2KPro, busted sound card (just went out yesterday).

I don't feel like building my own. I built the one I'm using now and it was such a pain and I'd rather not deal with it. I don't need a monitor, I don't need a printer so all those package deals from the major sites are out.

I want a 2.0-3.0GHz, 512/1G RAM and a decent video card (not one of those cheap integrated ones), XP Home, and at least an 80GB+ HDD. A machine that would play Unreal 2K4 well.

Anyone have any ideas? I'm trying to keep it under $500 if possible.