I am thinking of getting the new macbook and using it in my day to day demo recordings however I have heard that USB isn't fast enough to layer tracks without latency (i.e record guitar, then record vocals over that, then record accomp over that etc.) i need to know that if I bought a usb audio interface such as the 'm-audio mobile pre usb' i wouldn't be having to manually move tracks about to line up the audio. I don't want people arguing about firewire in here, just tell me if it can work as this is 1000+ pounds i am spending. Also, is four gigs of ram going to cover the next version of OSX? and by cover i dont mean support with all settings turned off.