Yeah, like I said, $300-500 total for the mini system.

I think once the Myth group get this type of solution working full-time perhaps someone will step up and come out with a more integrated mobo offering all the pieces required along with suitable little cases. Or maybe they/you might be interested in looking into a SoC platform and then write for that instead. The hardware is much cheaper and much smaller. Not as fast, but generally it doesn't need to be.

You can see the internals of two devices from SageTV that run on Sigmatel SoC in this "unboxing" of sorts.

There isn't much stopping any enterprising individual from getting similar devices produced en-masse via an ODM/OEM if MythTV could be made to support them. The Sage guys did not design the hardware for their products.