I'm looking to replace quite an old PC that has finally kicked the bucket (motherboard problems). Over the past six years I have actually replaced quite a few of the parts in it (it ended up with a 6800GS, 4 gigs of RAM, etc.) but it was still a very old machine underneath. It was still able to run most new games though, most importantly New Vegas.
Anyway, I want to know whether a modern "desktop" PC would be adequate as a replacement for this ancient "gaming" PC, or whether I still need to spend £500+ to get something that can run games. I'm not averse to taking some of the parts out of its corpse to rejuvenate a new machine, but I guess I'd like to avoid that if it means I'd void the warranty on a new computer.
There was a time when I had a pretty good idea of what I was doing PC-wise, but many years of contentment have left me hopelessly out of the loop. Any advice?