I've gone from having a 27" iMac to one of the new 15" retinas and am having trouble with figuring out the best way to store my iTunes library. I've got a 17gb music library and 200gb worth of apps, videos, PDFs that I only need when I'm at home. Currently I've got it all stored on a hd that's plugged into my airport extreme. Basically I'd love to be able to have my iTunes music everywhere with me on the go but don't care about anything else. What's the best and easiest way to go about splitting my iTubes library? The easiest way would probably be to just store my movies externally but then what do I do with my 50gb of iphone/iPad apps as there is no way as far as I know to stop syncing my apps to the computer.