on the 2.4ghz macbook, is it worth another $135 for 2g more ram? i know if i buy a mac it will be fully loaded with programs so RAM will be needed. i have 512mb ram now, and i get by with it, and 2g ram on a new computer would be great, i was just wondering if that extra ram is worth it. is 4g ram overkill, is pretty much what i am asking. oh, and on a side note, does anyone know where i can get a college discount other than $50 off at apple.com?