I have a sapphire 6870 power my pc right now and i have a 600w corsair gaming series psu powering that and i was wonder to get my pc to run a asus 6870 and a sapphire 6870 for cross fire in the future anyone know any good psu's that could do this i know i'm looking for a 750w for the 4 pci e connecters for power just wondering if i should stick with this brand and get the 800w gaming series or is there another brand thats good for this job to.