if you can... get 9600xt instead. its only $10-20 more I think....
AFAIK, Sapphire is very overclockable and the ATI one as well. Powercolor has the highest memory setting out of the box, its clocked at 500/337 while others are about 500/300 or 500/325... good if you do not intend to o/c the card.
Also consider Gigabyte or GeCube's card, even if it's cheaper than other cards.. it performs really well.