I seen this in action and they are nice. This is a Diskless inclosure so drives are separate.
http://www.amazon.com/Synology-DiskStation-Diskless-Network-Attached/dp/B005YW7OLM
And some 3T drives.
http://www.amazon.com/Red-3TB-NAS-Hard-Drive/dp/B008JJLW4M/ref=pd_sim_147_1?ie=UTF8&refRID=0QYHFM7T1SX0V0AJYGHA
I have this one.. this is Buffalo Linkstation Diskless inclosure. Drives are separate but you can bundle one with drives in it. I have Two 3T drives. It has a FTP server, DLNA, iTunes server, BitTorrent client.. which is cool. Permissions, user accounts.... groups and more. But I think the Synology is better.
http://www.amazon.com/Buffalo-LinkStation-Enclosure-Performance-LS421DE/dp/B00CO0DE0W/ref=sr_1_sc_2?s=electronics&ie=UTF8&qid=1438293193&sr=1-2-spell&keywords=buffalow+linkstation+diskliess These both sit on your network rather hook direct to your PC making is so everyone can use it.