This is almost exactly what I have actually done, minus the SFF part. I got some good deals on a few SM X9 boards, and picked up the corresponding E3-1270v2 CPUs and 32 GB RAM.I'd heard compatibility issues with usb adapters.
For home use I think you are better off getting a LGA1155 SFF unit ~$100, add a Intel dual port NIC and call it a day. Just need to make sure processor has AES-NI.
One machine for NAS, another for virt host, and a few others to supplement. Even though my virt. workloads are light and the NAS has only a few users, my concern is that 32 MB is a bit short these days.
It's alll still being planned out. One of the things I will be very careful about is noise.
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