I'm using a H70 in that case. Specs in sig. 32C idle cpu, 55 to 60 loaded. GPU idles around 36 to 38, fan at 50%. Games at about 60c at 80% fan speed. AC at about 76F. The fans are crap though, replaced the top fan with a 120 because it wouldn't start unless I flicked it. Only replacement fans I've found are Xigmatek. Don't know whether to try them or not. I could only use one 120 fan on top because the H70 radiator and fans are in the way of the rear fan. I wouldn't bet on a H50 allowing a second fan to be placed on top either. Looks pretty tight, maybe with cooling lines on the bottom. Mine are on top.
Just checked with a H50 rad, it will fit with two fans on top but the cooling lines probably need to go on the bottom. Pretty sad I have both, but when I went to MicroCenter to pick up the case I got the fever.