I need to upgrade my TimeMachine HD and I am torn between which interface to use. I am currently looking at the following Lacie drives: https://www.lacie.com/us/products/product.htm?id=10628 or https://www.lacie.com/us/products/product.htm?id=10554 I have done a lot of reading and I am confused. I know FireWire 800 is faster than my USB 2.0, but I have seen people making comments that you won't see a huge speed increase with these types of drives using Thunderbolt. Both drives have USB 3.0, which will surly be part of my next iMac. Does the Thunderbolt option, which carries a larger price tag worth it? Thanks!