If you put the 580 and that CPU under that kit, it wouldn't even matter if it had water in it.
You could do this with just another 470.
EDIT: But seriously, maximum power does not go with quietness. And you could just buy a case like the 800D, which can fit three 120 rads in it. Couple that with a fan controller and your set!
I need lots of ram for SSAAin unreal games.
If the 6990 could do SSAA id get it in a heart beat.