One more feedback, I am using Power Logic 600W on my old comp, Baton 2800+ with X800XT... So far so good, since it has a dual rail 12V too... I think if you wanna go for PowerLogic which is the cheaper brand of PSU, get the higer voltages one... Over 600W, so that you'll never over stress ur PSU and it will as well last longer.

IMHO, lower-end brands' PSU with high wattage is still sufficient to sustain your comp if you are not running SLI or GF8800. Just that they might not last as long as branded ones. But hey, they are much cheaper!!!