I ended up getting a refurbished Dell XPS 8300 for $589.
I've seen people get lower prices, but I don't see how it could possibly be a bad deal.
I7 2600 Processor $300
500 GB Hard Drive $100
Windows 7 $100
Already up to $500 in parts not counting anything else.
Comes with 8 gigs memory.
Crappy video card (Nvidia GT 530)
460W Power Supply
All the other basic computer stuff.
1 year warranty.
I'm not in to overclocking & if I get the bug to play some more modern games I'll buy a better video card someday, but I prefer to buy cheap old ones. They seem new to me.