Antec NeoECO 620C 620W 80 PLUS Certified Active PFC Power Supply

http://www.newegg.com/Product/Product.aspx?Item=N82E16817371031

Very reliably reviewed power supply for a desktop. Enough power to fit most builds unless you're doing something crazy.

Bought it, realized I didn't actually want to build a desktop. It's new, and in an unopened box. Newegg's got it for $65, I'll sell for $60.

If you buy this with the Fractal R4 case, I'll sell you both for $140.