Comment EPIA SN 10000 (Score 1) 697
I think "EPIA SN 10000" or "18000" is the best in kind of performance and energy. I was thinking about some MIPS or ARM based boards, like rt433uah, but there are problems with performance and sata ports.
EPIA SN 10000 is standard PC, in really small form factor, and have fanless CPU 1.0GHz, up to 4 GB of ram, 4 sata ports, 2 ethernet ports (one of them is gigabite), audio, ide, compact flash, minipci, and lots of usbs. ANd of course vga. I'm currenlty creating system from it, and mirrored set of 4 caviar green series hard drives + system on compact flash. Eventually i will add one SSD as a kind of cache. All powered prefrebly by ZFS :)
All i need now i good and efficient Power Supply for it.