And there is no better pudding then my setup your fx 55 has nothing on my D805 blowtorch @ 4.3ghz it should be somewhere around 300watts (if at 4.1 its @ 259 watts) and its at 70°c. If a dared to put my 7900gtx in the cooling loop I thing my pc would melt.
I would go for something from danger den , I got the 1/2 black ice radiator (using the pump adaptors)because I was going to swap everything over to custom build. The one thing is the corsair has a pretty good pump in it already. I have not pursued the custom build because I have contemplated using a peltier setup so doing more research.
Way back when I did have a big water 745 kit from TT, and it did a better job cooling, but it lack of quality destroyed a video card . another viable source would be gigabytes wc kit, heard good things about it.