Hello, How are you? I am wondering... If I get a base 27 inch iMac with the standard 1tb HDD, can I use an external SSD as a boot and system drive? I can get a Samsung 256gb SSD for an excellent price. As for the enclosure, does going for a Thunderbolt enclosure guarantee better performance? Or will it be the same as a USB 3.0 Enclosure? Anyone done this? Are you happy with the results? Cheers!