I'm looking to jump into the Mac world with a laptop. I've done all sorts of internet research, been to the Mac store, and now I'm asking the experts. I've ruled the 17" out as too bulky to be portable. The 13" is slightly smaller than my work machine (a T400), while the 15" is slightly larger. Either size would be acceptable, and the cost doesn't bother me--but I don't want to spend more than I need to for a suitable machine. I do not game, do heavy graphics, or even heavy photo editing. On photos, the most I would do (typically) is crop/resize to fit a particular size and light retouching (redeye and the like). On video, I generally just import--no editing at all (just cutting out what I don't want/need). All I really do is basic productivity--word processing, email, internet--plus use itunes and skype. Hence, my question: am I wasting my money if I buy a mid- or high-15" MBP? Am I better off with a high (or even low) 13" MBP and using the extra cash for a 500GB/7200rpm hdd and 4GB RAM? Should I be giving serious consideration to the MB? Thanks in advance for helping a rookie!