Just threw in a random mid ranged card to get an idea and that was a TX750 unless you wanted modular?
Rampage is a great board, but its also overpriced. For P55 gigabyte has another great ocing board. The P55m-UD4.
The Gene will probably net you the better oc though.
i dunno how the Coolit ECO ALC 92 will perform though its basically a h50/ECO ALC but a shrunken rad down to 92mm so I'm going to strap some high CFM fans for a push pull onto it, but i'm still not sure what temps i'm gonna get