I just got that DFI board as an upgrade from my P5N-E today
Which board you should get depends on your budget. If you wanna spend less, the gigabyte DS3L is a good choice, if you wanna spend more the abit ip35 pro is a good board, and if you wanna spend even more you could look at the evga 780i or one of the high-end ASUS X48 boards, for example.
Oh, and chozart--there are a couple people over in the intel CPU forum who have managed 3.5GHz on their q9450's. With the extra cache and SSE4.1, I'm guessing they'll outperform similarly and even higher clocked q6600's by a reasonable margin....
edit: Mind, some people seem to be having trouble getting q9450's over 3.2GHz or so. It seems to be related to VID--at least one of the 3.5GHz ones I've seen was a 1.1225 VID, whereas one of the guys who's still trying to get stable at ~3.2 is a 1.2325 or so (can't recall exactly).Edited by TriBeCa - 5/28/08 at 12:57pm