Thanks for the reply, made me remember SATA 6 Gbps is pretty much unneeded and your point of mechanical drives not getting near those speeds gave me better perspective about the build.
Wasn't intending to overclock, just happened to be a 'feature' of that board.
Anyway, I am currently testing unraid on an old AMD Athlon Socket A 1Ghz w/ an PCStats board (I forget the model # off the top of my head at this moment). Addons include subsonic, transmission and ps3 media server. So far I have subsonic and transmission working great and am ready to go 'full scale'.
I am looking to get 2x 2TB Seagate 5900 RPM drives, 1 for parity and 1 for data and migrate over my existing 2 Samsung Spinpoint F3 1 TB drives for data to start with, allowing an extra 2 slots for future upgrades.
I haven't really looked into atom, wasn't quite sure if it would handle streaming of HiDef video.
Thanks again for the point in the right direction.