Funnily enough, I was pricing up that exact combo recently. It will, unfortunately, probably only fit in the "server room" (cupboard by the front door) sideways, though. Also, that board only has 4 SATA ports, and there's 7 bays (6x3.5" and 1x2.5") in the case, as far as I can tell. Zotac have a Mini-ITX board with 6 SATA ports, which is another option, but that requires a separate, "proper" CPU.

My "upgraded NAS" project is on hold at the moment, though; my netbook was stolen a couple of weeks ago, so I spent my toy budget on replacing that first.