I am looking to pull the trigger on one of these in the next day or two. I've been having trouble deciding! While I love the look and function/speed of the 15" I am worried a little about the size as it's been years since i've opened a 15" -- but part of me wants to try again, and have the extra screen real estate, speed, graphics, etc. I do travel once a month on plane and work in coffee shots twice weekly. View lots of MRI images and write papers. Please help! Just affraid the 13" maybe to small and I won't be totally happy with it, despite it being 'such a good size'. Yesterday at the apple store here in Seattle, I texted the 15" 2.7,n 16GB and it was lightening fast (impressive). Any thoughts much appreciated!