For dualcore and OC the E8400/Xeon3110 is the only CPU to consider, for Quad Intel is still better but AMD has gotten close enough in performance. Power consumption and overclockability is generally better on Intel quads.
Other parts of the system: refer to your AMD thread, the guys there are giving you good advices, but you should consider the E8400 as well, its so damn fast and easy to OC/cool that it cant be disregarded.
Edit, my post crossed with CGRs posting, thats a nice setup as well, E8200 should be able to reach 4GHz, or very close, with reasonably low temperatures.