Lots and lots of replies! This is great! I'll try to address as much as I can.

Quote:
The Via EPIA stuff (here) is also pretty low power.


I had looked in general terms at mini-itx boards and found them to be overkill. Now that I'm looking specifically at the EPIA boards, I do believe one of them might work for me. There are quite a few, however, so the key would be to find the one with basically the least features at the least price, and then find a modest, unassuming case capable of holding two drives.

I did also find some mini-itx boards using the Geode (like genixia suggested), but couldn't find prices. The other Geode boards I saw were SBCs that were way too costly.

Either way, assuming I could find a suitable case (one that doesn't have neon or anything, and has the right venting to run this thing fanless), I'm kind of leaning towards a EPIA solution right now.
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-Aaron