This is what I always advise: If you're a guy who'll take the machine to work, open it & use it, close it & take it home, the 17" size will be perfect. BUT, if you REALLY use your notebook like a mobile computer, you'll probably find the 17" a bit bulky and cumbersome in most situations. I'd pick the new 15" AlBook as it's faster and has a MUCH better video card.