Hello, I'm looking for a fast, external hard disk unit for using with my rMBP. There are tons of USB 3 external drives here in Brazil, but I wouldn't like to keep a precious USB port busy. I'd like to use a thunderbolt port. I'm currently using only one of them with a gigabit Ethernet adapter. Lacie units are too expensive here -- a 1TB Lacie Rugged USB3/TBolt costs around USD 700,00, so I'm looking for the cheapest way to get a thunderbolt external drive working with my machine. Any ideas with links? Thank you!