The power requirements for the 2 8800 ultras are TWO six pin pci-e connectors. If mike decides to upgrade in the future to two gtx 260, it would also require 2 pci-e connectors per video card according to the evga website http://www.evga.com/products/moreInfo.asp?pn=896-P3-1268-AR&family=GeForce%20GTX%20200%20Series%20Family
I really think he SHOULD get the one i posted before, here it is again. THIS really is bang for buck. http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006
The one below is the one I bought, and yes i got it from them. it has almost 50 dollars off compared to newegg and i paid 300 dollars when i got mine. THIS is something you might want to get if u were to upgrade to video cards that use ONE six pin and ONE eight pin, like the GTX 280 and other HIGH END video cards. I dont think u can get this psu any cheaper, but then again if 2 gtx 260 are more than enough for you then you dont need to get this one, just get the one i posted above. http://www.jr.com/real-power-pro-1000w-power-supply/pe/CM_RSA00EMBA/
NO MORE TALKING ABOUT POWER SUPPLIES. MOVE ON TO SOMETHING ELSE.