I'd like to install the NAS inside my wire closet and the space is limited. I'd like to take look if any of VIA's pico-ITX, nano-ITX or mini-ITX motherboards will meet all requirements. Other away to reduce the size is to use external HDD for storage.

I have selected QNAP TS-109Pro and it size is 210(D) x 60(W) x 182(H) mm and the HDD is installed internally. The only drawback is the external power supply, but not big problem.