Hello All. I need an external HD to backup a 500GB drive in a 13" MBP. This will be for cloning, and will need to be bootable. I'm not too fussy on either Firewire/USB/Thunderbolt. I do have good experience with Firewire, but might be interested in Thunderbolt drive.... Should be portable, and bus powered. Price is not a huge issue, but want good value for the money. Also open to hd enclosure and drive combos if that is any better way to go. Any input or recommendations appreciated.