I'm not sure this is what you were looking for, but I got bored.
prices taken from newegg
many of these could be had for cheaper on ebay or wherever, but be careful.
really great for the price:
Intel i3 2100 - $125
Antec 300 case - $55 (45)
ASRock H61M-VS 1155 mobo - $60
G.Skill Ripjaws 1600 4gb - $30
Video Card: I just bought a Radeon 5770 for $65 used, that's a pretty amazing value. If you want a new card, you will get a lot less for the money.
Power Supply - $39 (27)
more stuff you'll need:
HDD 250gb? - Astronomical since the flood AKA $80
$432
The mobo allows you to upgrade to a better Sandy Bridge later, but the 2100 will probably work well enough for a few years.