Fully works with OMV. Sure, it is not cheap, but it has everything you need for a NAS:
X6 SATA3 Connectors with RAID
Full size PCIe slot at 4X speeds (more than enough for additional SATA controllers)
Dual NIC, Intel
On-board dedicated USB connector with DOM support
The board is very low power and is suitable for server applications, and can easily reach speeds of 124 MegaBytes a second (roughly 992 megabits a second) over SMB/CIFS and FTP. Works right out of the box and network bonding is fully functional. Completely passive, no active cooling needed. I can't make it justice here, but all I can say is that it was worth the price.
More info here: http://www.supermicro.com/prod…ATOM/ICH9/X7SPA.cfm?typ=H