I suggest a Q6600 if its gonna crunch.
I have a few of each type-
As an example since I started back up and the Quads(q6600 and qx6700) have done about 140+ each since the Aug 28th (Not at 100% dedicated) the AMD 6000+'s have done 104 and 72. The 72 count unit doubles as my main home server for 3 weather stations, DNS, web, email etc...

Just my two cents and ever growing electric bill, cant wait for some cold Texas winter days to try out my new collection of heaters