Logainofhades, what type of thermal compound are you using? Did you lap the Arctic Cooling heatsink? My rig is almost identical to yours, but my CPU idles around 32C, and rises to ~42C under load. I would be nice to shave-off a few more degrees.
Right now it's running at 9.5 x 273 = 2.6GHz, with memory set at 533 and HTTx3, stock voltage. It was very easy to achieve this overclock, and I definitely want to push it to 2.8GHz for everyday use, but I kind of wanted to get the temp down a bit first. The AS-5 I used should be cured by now. I've run the system over 200hrs and turned it off several times to temp-cycle the thermal compound.