I am currently running an i7 930 and a GTX 470 on an Ultra LSP 750W power supply. I purchased a 9800GTX+ for PhysX and realized that my PSU couldn't push both cards (received boot problems). I also plan to get another GTX 470 for SLI, OC my i7 to atleast 4.2Ghz and still want to include that 9800GTX+ so I was wondering how much wattage should I look for on a new power supply as well as Amps on the +12V rail. Please consider that when OC'ing my CPU I will be buying a high end CPU cooler as well.
I was looking at the Corsair HX1000W PSU but I don't know if that would be enough or overkill. I was hoping to not spend more than $250 on this unit.