I am making a purchase today. Condensing my black box windows PC + Macbook Air to a 15" MPBr. Amazon has the older MPBr with 512GB HD for 2299 and the current with 256Gb HD for $2079. Which one would you go with? I have a few 3.0 USB 1TB laptop drives, but don't know which one I should get. I am guessing the new revision has fixed the issues from the first run? The older MPBr should be have been manufactured in late 2012. What do you think? Need to order in a few hours.