I have a Sapphire 6990 with an aftermarker cooler by Artic Cooler. I had it Crossfired with a 6970, but then I upgraded to 680gtx SLI.
Runs pretty darn quiet and way cooler than stock. This will take up 3 slots when installed in a PC. I couldn't stand how loud the card got on the stock cooler, I had to install this cooler and it was worth it.
Just clearing out a few things... Not really looking for trades, except Z77 boards, and they have to be damn good...
MSI GTX 670 2GB - Reference - $215 Shipped
Have Original box and accesories. Works great, and OCs like a champ!!! I've had it for about 2 years, 1 year stock cooler w/ stock clocks, and up until a few months ago it's been OC'd on water and hasn't see 60c in that whole time.