Hi all, I am ready to buy a new macbook and have been waiting since winter break for the updates. I however cannont decide between the base 15" or the high end 13". I am not exactly sure what my needs even call for. I am a junior engineering student, I use a lot of excel, word processing, photoshop, and a couple minor engineering programs. I would like to get into photography a little more and may be trying out aperture as well. Other than that I surf the web, listen to itunes, watch movies, and play a few games once in a while. The games I play are usually not that high end(heroes of newerth, AOE, rome, and those type of games) but it would be nice to play them on decently high settings. The portability of the 13" is a major plus, but how much is even really compared to a 15"? Any input on this would be much appreciated, this is an expensive decision I want to make right.