Given that he has posted in the Intel Motherboard > Socket 775 section, I would presume that he is looking at C2D or C2Q for the processor.
I've got the DFI 680i, and I can get about 3.25Ghz out of a 2.4Ghz chip, though I'm sure I can do more, I just need to work on it more.
A lot of people seem to like the EVGA 680i motherboard.
However, I'm still getting my feet wet, so I'll refrain from actually making a recommendation.