If anyone ever used an atom, they would know that a celeronD is no comparison. For one, celeron halts on any multitasking or multiple calls, it has no hyperthreading. The celeron might have more raw power, but having used netbooks vs laptops with celeron D's..... celeron chokes nonstop plus uses more wattage. I would take a N series atom over a celeronD anyday. And of course the D series Atom rocks and is viable for many things. However, you could even go single core atom on a mobo....
an atom uses single digit watts on idle. The ion part makes it burn up wattage. The problem lies in finding a board with 6 sata on it.
However, this board here, this is the lowest wattage setup I could find. All one needs is a pci-e sata card. If you raid, add-on cards are normally higher quality for cheap too.
Single Core w/ Hyperthreading
that board you pointed out is a very good one, on newegg, your first thought. Overall, that would be quite powerful. I am not sure you need it. Cost wise, jeez, that is cheap. Good thing abotu the D510 is its 64 bit memory usage. If you went Linux, I am guessing it could be a cheap little rocketship with 4 gigs in it and 4 threads.