Hi everyone! I'm off to college in a couple weeks, and want to upgrade from a Mac laptop so hopelessly outdated that I won't even mention it I've settled on an Air, 11in with 8GB of RAM. For the big stuff, I'll have a 19in monitor in my room. The question is, is the 300mhz i5-i7 upgrade worth the extra $140? How much of a difference does it really make in everyday computing? I'm going to use it to run iWork, maybe Office, a couple older games, web browsing/network hacking and a little coding. Typical techy college stuff. I would like it to remain useful for several years, if possible. What would you do? Thanks!