Not sure if this has been posted from before but Corsair is making a small HTPC SFF barebones case with a motherboard and power supply in it. I wonder what could be the total volume for it.
http://gizmodo.com/corsair-bulldog-a-living-room-pc-with-a-face-only-a-ga-1708126084
http://gizmodo.com/corsair-bulldog-a-living-room-pc-with-a-face-only-a-ga-1708126084