Concur fully, the overclock is superior with the i7 920, in addition you have ddr3 memory which adds extra push in speed, MB are actually good stuff, I have a Gig MB that is fast and handles all the speed possible for the i7 920.

There was a time many years before when I started with my own case; I would complement a medium grade processor. Then I realized, placing a little more into the build will save you money in the long sprint as it will provide you 12 - 24 months more service.