As long as you stay clear of Sapphire it should be good, though I can't vouch for any of the others, except Asus. I've ordered an Asus HD4870x2, and I'm expecting good things. Had a Sapphire X800-card back in the days, and it was utter crap from the day I got it. Bad drivers, bad cooling, bad performance, bad everything.
Intel Q6600 G0 | Asus P5N-T Deluxe 780i | 2x2GB Kingston HyperX PC2 8500 | XFX GF8800GTS 512 | Antec P182 | Antec TruePower Quattro 1000w | Tuniq Tower 120 | Sony 52" KDL-V5500
Not updated 3Dmark06 top score: 19995 / 14772 (Full AA/AF)