I posted about a nice little Mini ITX board here:
http://www.serverelements.com/forums/viewtopic.php?p=13773#p13773It should work real good with the new NASlite-M2.
It's about $80 and you can get 2MB of ram for it for about $20. It all ready has a 1.6 MHz CPU and gigabit LAN on board.
Just need a power supply and case with hard drives. I made my own case out of sheet mettle. A 90 watt very small power supply that cost about $50 for it. You can get WD green type hard drives that a 1TB now for about $100. All that will save a lot of power and $
-Raymond Day