So I've just about decided I want my next computer to be a rMBP. Coming from a core 2 toshi with a 320 gig hdd. Price wise I like the base but I'm concerned about the 256 gb storage as I feel that's kind of a step down. On the flip side, I only have about half of the 320 taken up. I really only store mp3 s and other than office I don't have a lot of programs. My main concern is if I end up needing more space what do I do? Obviously external storage is the probable answer but I was curious just how convenient that is? Before you ask, an air would probably fit those needs but I feel the screen on that is too small and the cMBP isn't really that much of a leap in my mind to justify the costs.