Oh man, here i go again.
AMD cpus are more efficient than intel, they are able to do more work per clock cycle, which is why they perform as well/outperform intel CPUs which are in the 3+ ghz.
The AMD Opteron 165 is one of the favorit CPUs for gaming/work related usage. You might want to do a little research about it before posting another comment.
But pushing the voltages up a little, depending on the stepping you get, you can hit anywhere from 2.7-3.0 on stock air cooling. You are paying 320$ for a cpu which almost matches up with the FX series.
My current specs:
Biostar TPower x58
XFI GTX260 Black Edition
640 WD Caviar Black
Vista Home Premium x64