i'm looking to buy a 1tb external drive for my new rmbp, it looks like the options for an ssd drive are still both sparse and expensive, so it looks like i'll have to go for a hdd what are the options I should be looking at? I've had lacie rugged and wd passport's fail on me in previous years. what's the point of thunderbolt on hdd externals? surely their speed limit negates any benefits? thanks in advance!