I already run a Swiftech 220-X water loop in my system, so far on the cpu only, but it's easily a robust enough pump and whatnot to support adding in a gpu cooler.
I really did want to go for the FTW, but from everything I've read so far nobody, even the FTW guys, is getting all that much better OCs than anyone else. So I've set my sites on the SC, and if it takes long enough and they become available, I could see myself going for the plain Jane 1080 GTX or ACX 3.0.
Also I'm not a huge OCer. If I overclock at all I'll go for something well short of pushing the edge, and be content. I'm currently running my cpu and 960 SSC at stock speeds. I think I'll do just fine without the extra power connectors.