Xion PowerReal XON-600F14T-201 ATX12V V.2.01 600W Power Supply - Retail
Antec TruePower 2.0 TP2-550 EPS12V ATX12V 550W Power Supply 115/230 V UL, TUV, CB, FCC CLASS B, CUL - Retail
Which is the best to power my rig, with everything in my sig, and maybe another 7900GT in SLI when i get the cash. the Antec one is nVidia SLI certified, does that certification make a difference in it's true SLI performance, or just a marketing thing. I've never heard of Xion PSU's before, but it looks like it has everything I need. However, I know Antec is pretty reliable. Anything has to be better than the 450W I have now.