I Am soon going to be purchasing the new rMBP. I have an old 2009 mbp at the moment. I use a FireWire 800 drive as a scratch disk and for loading music samples from. For the new rMBP would it be better to get a thunderbolt to FireWire adapter and continue using my current drive, get a USB 3.0 drive, or get a thunderbolt drive? I'm not sure of how much faster USB 3 is over FireWire...I know on paper USB 3 is superior but not sure for actual use. It is definitely most cost effective to keep on using my current Lacie 7200rpm drive and just get an adapter, but if there are great benefits for USB or thunderbolt drives then I'd like to invest in that. or does the new ssd make loading from an external disk unecessary?