Well, the brands really arent that different at all.
In fact, they are almost an EXACT duplicate of the original ATI/NVIDIA made versions, just that they contain little features such as extra/better fans and such that the different brands add to them to spice the card up a bit.
So in other words, brand name doesnt really matter. As long as it is the right card, any brand will be about the same.
Hope this helps!