Just FYI, most cards will perform the same even though they come from different companys, they just take the PCB, throw their own heatsink on it, and sell it. There are certain exceptions, (iirc) a few brands hand select good overclocking cards and mount them with better heatsinks, or send out cards with higher clock speeds. Usually if a card from a different company cost more, it has to do with whats in the bundle.
~Bryan~