Hardware NAS - Price check

I have one of these:

http://www.thetechlounge.com/article...t+ReadyNAS+X6/

How much is it worth? (Currently loaded with 320GB disks, but I'd probably sell it bare)

in good nic, anywhere between 2/3 to 1/2 the price new, as a rough guide. Better condition, better price. Plus whether you have any additional kit that came with it, box, manuals, cables etc.