It isn’t as pretty as this shiny box but the Lian Li EX-503 trumps its own qualities. It’s fairly cheap (about $240), houses up to five hard drives and connects via eSATA or USB 3.0 to your Mac. (You can get a SATA to eSATA card for a few bucks, if you need high transfer speeds.) Another option is to wait for Thunderbolt to eSATA cables or use the USB port instead. The case supports different Raid configurations.