The Thunderbay 4 is a favorite at MPG (Lloyd bought 5 of them).
See also RAID-5 Can be Partitioned to Suit, and there is no requirement to use RAID-5 of course; it is software and completely flexible).
The Toshiba 5TB hard drive is perfect for the Thunderbay 4, and very fast. So get 4 of them, and one cold spare (five drives total).
The Intel 600GB SSD has not been tested here at MPG, but $195 for 600GB is an appealing deal.