Corsair makes some very fine PSU's. Pick a model somewhere in the middle up. Don't get the cheaper/cheapest model(s). Make sure that it is at least "80 Plus Bronze" certified. I am enclosing a PSU calculator to determine the correct size for you, and also some good material to read before buying a PSU. Don't sell yourself short and go with the cheapest option. A good PSU is important!
Calculator: http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CCoQFjAA&url=http%3A%2F%2Fwww.coolermaster.outervision.com%2F&ei=1DojU9TALYzr0QGOzoDYCQ&usg=AFQjCNFvMxyFPtzLoOfDz_XocsUk22MzWA&sig2=Y6Q05JWj0iOKFCLdGdgf6w&bvm=bv.62922401,d.dmQ...