Hi all, I am a marketing student and I looking for a new Macbook, presently I am using a 13' MBP (2012). I am also passionate about photography so I use a quite a bit of Photoshop and Lightroom and dabble in the occasional AutoCad, I would be watching a lot of movies on it and playing music on it. I am very confused about whether I should be getting the 13' retina or the 15' retina, which ever i get will be the full spec one with 512 ssd. A big worry for me is the portability of the laptop. I want it to be powerful enough to handle all that i throw at and be able to carry it to lectures and workshops. Will the 15 inch be too bulky, considering that my current macbook is roughly the same weight, also due to the graphics card will the battery life be affected in a major way and will it also generate a lot of heat as compared to the 13 inch one ?. I will be making my decision pretty soon as I need to order it online, so that I receive it before university starts. Thank you.