You might just be better off with something like the HP microserver GEN8, I got mine for £127, with 4 HDD bays, a celeron (I upgraded to xeon), and 4GB RAM.
It's a lot cheaper than this build, and that case is very limited on HDD room.
http://www.ebuyer.com/722189-hpe-proliant-gen8-4gb-ram-microserver-ebuyer-com-819185-421