If you get one with an R430 core....send it back.
GW - Don't just piss in everyone's cornflakes....
The R430 core is JUST FINE, I have one, unless you are trying to really really overclock the graphics card.
I can only get mine from 400/490 to about 420/520... so its not much of an overclock...
HOWEVER, my R430 core X800 GTO also is able to unlock the extra 4 pipes, something I haven't tried yet, because I am have been very happy thus far with gaming, the only exception being the heavy shaded Oblivion, but I've found a nice mix on that, and its been very playable!
My decision came down between the X800GTO and the 6800GS on the Nvidia side. I am glad of the one I have, but I've heard reports that each works better with certain games.
Half Life 2 looks great, no slowdown even with everything up...
But remember, I only play in 1024X768, its the best I like for my 17inch standard Compaq monitor...
My stats are below: