That's funny, I've always heard that the Powercolor cards are crap and Sapphire is reliable. Sapphire actually makes the video cards that ATi says are their own, and the Sapphire boards are completely identical to the reference designes that ATi puts out.
I had a Powercolor board that just totally sucked *** at everything, and then died, and it was a friggin ***** to RMA and get everything working again.
BTW, my sapphire 9500 np worked great hardmodded to 9700 and OC'd to hell and back, but it died because I was running it way above its normal specs 24/7 for over a year. Moral: don't push TOO hard, and keep things stock whenever you don't need the extra power, and things should run fine.
Trios