Hey, so i have a MBP late 08 unibody and my sister has a unibody MB late 08 aswell. I'm a college student and find myself moving all the time and feel like the size and weight (5.5lbs) of my MBP is too much to carry everyday. My sister doesnt move much, much less than me and would only benefit by upgrading. Am i acting crazy about the size and weight, and will i not notice a difference? or would the smaller, lighter unibody macbook be a better option for my lots of movement lifestyle? What do you think?