As I have suggested elsewhere - you don't need the fancy graphics capabilities of the ION platform for unRAID - you can save $$$ and power consumption by using something simpler.  Some Atom based boards with the NM10 chipset work well.  Gigabyte GA-D510UD works well for me.  I expect that the D525 version would also work (uses DDR3 instead of DDR2 memory).  All four SATA ports on the board work well.  There's only a PCI slot for expansion (no PCI-e), but with an Atom CPU that's not a big issue f