I discovered a positive development for both server options today: First, the Q9400s, a lower power version of the Q9400 which would work better in the SFF case.  Secondly, I learned that I can boot to a software RAID1 setup, which makes the Atom route more appealing, which I’m now leaning towards.  The Atom should have enough power for a basic web and file server, while running cooler and using less power as well.