It's XFX for a start they are the only ones to have a better warranty than EVGA, and it's a 6990, nothing can touch it in terms of performance, I'd love to have one of those!
Looks, baby looks!! Good cards, I have a 5850 that's been just fabulous. And if you register within 30 days of purchase, you get a lifetime warranty, What else could you ask for?
I haven't had any trouble with XFX in the past, but I hear the service is great. I've been seriously thinking about switching back to a Radeon after having an NVidia based card, and this would certainly put it over the top for performance! I've already got a 1000 watt PS sitting in my machine just waiting for a top performer from XFX!!
What I like about the 6990? I like how AMD has manged to keep the clocks pretty high while cramming two GPUs on the same card. So it's not dramatically underclocked like the 590.
Speaking of my ride, I'm rolling around in a Pontiac with 180k miles on the odo, so there's a decent chance this card is worth more than my ride :-p