Intel Intel!

And a Q6700 overclocked beyond 3 jiggaherz =D

Well that's my rigg and I'm very satisfied with this. Q67 is your thing if you wanna overclock. Incase not, then get one of the newer 45nm models, which is the Q9x series, they consume less power, produce less heat but are not so OCworthy.

Funnily, the stock coolers of both the old and I think the new ones aswell are very silent and effective, especially in a closed case. Since I got it I can hear my HDDs singing =(
And if you wanna work much with lots of Ecos (grass trees etc.) get 4gigabytes of RAM! I almost always exceed 2gb when I'm running something else nearby.