Just my honest opinion. Even If I had waited to tommorow to order my new pc with more money saved. I wouldnt even think about buying any dual gpu card until the nicey nice aftermarket non referennce cards came out with better cooling and overclocked from factory. The only reason I bought a reference 6970 is because I knew I was eventually going water cooling. Thus I will make cricket noises till the fan falls off cause its an xfx and the warranty covers aftermarket cooling. And I'm not out $700 bucks for something that (benches) better. When I can have $420 in a nice decent overclocked card with no noise and H20.
The whole green vs red thing is crazy. It's like Intel vs AMD. This rig is my first intel and I love it, but I built what I wanted for a price range, best bang for buck. But if you have $ falling off trees, by all means go crazy. And since you stated a budget up there, I'd suggest listening to Tom and going for single gpu in sli or x-fire. (more bang for buck)