So I'm deciding between the Mac Book and the Mac Book Pro. I know the macbook is more portable, but my question is, is the 15 inch pro incredibly non-portable? I really don't like the fact of not being able to upgrade more than 2Gb of ram with the macbooks. I am currently using a Dell Inspiron 600m with a 14 inch screen. I don't know it's weight, but it's pretty portable. I would be willing to sacrifice some portability for long term performance, but not if it means being weighed down. I can't make it to the Apple store for a few days to compare in person, but can anyone help? Thanks a lot.