New poster. I'm looking for a new CPU HS as well. I'm currently using an Arctic Cooler Pro 7.
No overclock (yet!), so it's running at stock speeds and temps:
The ones I'm interested in currently are the Thermalright Ultra 120 Extreme, the Thermalright IFX-14, and the Zalman CNPS10X Extreme.
Just the ones I'm currently looking at, I'll be looking over any suggested here, of course. I've tried a few overclocks just for measurement purposes, and my CPU Vcore quickly hits 1.5v, my temps in the mid to upper 60C's at idle. I think I need a better HS than the ACPRO7.