Just finished a new built & did some extensive research that may help you.
1. 650w or 750w psu might not be enough IF you are planning to SLI in the future. 850w seems to be the min if you are going to sli + OC.
2. Can save some money on the air cooler by getting the Hyper212 (seems like general consensus for best bang for your buck cooler) can buy 2nd fan for push pull when you need to. http://www.newegg.com/Product/Product.aspx?