I have a ZALMAN LQ-310 (I think any of the Asetek OEM builds will do - just whatever happens to be on Newegg promo at the time). Sorry, I was trying to remember temps off the top of my head. I normally worry about GPU temps more than the CPU.
Anyway, I just fired it up. Idle and normal processing hovers between 35-40C. Gaming on Skyrim runs it up to about 45C. And I just ran a Cinibench CPU test in continuous loop for 15 mins. Temps maxed at 49C and were stable. Ambient temps are 78F.
This was my first time over-clocking. So I just set the multiplier to 20 for an even 4.0 Ghz. I didn't mess with voltages at all. I tried going above that, but it wasn't stable. I was happy with the 4Ghz, and so I've just left it there.
I also modified my setup to make it run quieter. I'm using a single Noctua NF-P12 fan sucking air through the radiator and ejecting out the back of my Line M case (also another Noctua NS-F12a for intake at the front of the case). If I had problems with Temps, I would put the Fan in front or even add a 2nd fan in push/pull. But in this arrangement, temps are great, and the system is very quiet. Another reason why I eject the CPU radiator air out of the case is to keep my air cooled overclocked 7850 cool. So, again, I could keep the CPU cooler by using fresh case intake air, but in that setup, my 7850 ran a lot hotter. Overall, this was the best balance of CPU & GPU temps and running the case as quietly as possible.
Hope that helps!