I have had nothing but problems with powercolors. The only brand I would avoid more than them is zotac. My old 5850 didnt run right with the stock settings. I had to give it a little extra voltage just to run at stock speeds, and it couldnt OC at all. Then I had a powercolor 7870 that did the same exact thing, needed more volts to run at stock specs. Now zotac on the other hand.........anything that can go wrong with a video card will go wrong if you buy one of those. Stickers put on upside down, stickers peeling off, fans dying, thermal paste drying up, outputs randomly dying, driver crashes etc...
EDIT - For reference, my favorite nvidia brand is EVGA/ASUS and my favorite for AMD cards is XFX/ASUS. You cannot go wrong with an ASUS card from either company.