I have the 13" rMBP, but I'm wondering if I want the rMBP 15". The main thing that has me thinking this is screen real estate. Simply put, I'd like more of it, but I'm a retina convert so MBA is not an answer. I don't travel all that much, but I do like the form factor if the rMPB 13, as well as the weight. In practical use it seems that the 15" really is much bigger, esp footprint. But then again, the screen real estate... Sort if in a quandary as to what to do. First world problems.