If you are thinking of watercooling your 7970 i would look at doing a custom loop for it. It is basically like an H60 for your video card, which although it will provide some better cooling and less noise, it is not worth the money IMO.
Many reviews for it say you need a third hand to install it, so if you do buy it make sure you know how to install it or have a friend who can help you out
My BuildI7 3730k at 4.7 ghz
H100
16gb Corsair Dominator GT RAM at 1866 mhz
2 x Asus GTX DCU2 670's overclocked at 1258 mhz
1 x 1tb Storage Drive
1 x 2 tb Game Drive
1x 60 gb SSD Boot Drive
CoolerMaster HAF X
Kingwin Lazer 1000w