Well, and a little bulk I guess. The 13" is such a nice size (was originally thinking of MBA but, nah) but the 15" screen, is really tempting. All for an additional weight of 1.1lbs! To those who have (or have used) both the 13" and 15" models, is the added weight and bulk worth it? I'll be using it for work (have a 27" i7 iMac at home for everything else) and I will be lugging it around a fair bit - to clients' offices, as well as to and from work from time to time. Won't be doing anything intensive except heavy document editing so the C2D v i5 debate is mostly moot. That screen real estate is what I'm concerned about. Budget isn't really a factor, as it'll be (mostly) paid for by work.