I won't go price hunting for you, but here's what I'd pick...
Intel Core i5 760
MSI P55-GD65 USB3 motherboard (or like an Asus P7P55D E Pro)
4gb G.Skill Ripjaws CAS9 or CAS7 if you can find a good price
1gb GTX 460 card (EVGA is my favorite)
750w power supply (a decent brand, Corsair etc.)
Antec 300 case
Hard drive whatever
GTX 470s are nice, but the 460 right now is a MUCH better card for the price. Two 460s in SLI are deadly as well - they scale super well - just make sure you go for the 1gb versions.