I'm currently running a Lacie rugged 256 as my boot drive. With an internal 2TB for my media. My question is.....if i stick a crucial 512 SSD M550 in the single internal slot. Whats the best solution for the 2TB media library. Is there a cheap 3.5" thunderbolt enclosure out there that won't throttle the 7200 rpm? Ive got a 21.5 2011 iMac and the dual internal solution looks horribly complicated. Any thoughts.