Greetings fellow Mac users: I have enjoyed my 2011 MBA for one year and decided to let the wife have it lol I am looking at the 13" MBPs as a "processing" upgrade from my current MBA and was wondering what your recommendations would be. I am shooting for around $1500 for the computer. I wanted to know if I am shooting for computing power and running programs/software as a chemistry graduate student, would the following be advantageous: 1. Get the 2.9 GHz versus 2.5 GHz? 2. 8GB versus 4GB RAM 3. 750GB > 500GB? What about 128GB SSD > 750GB hard drive? My MBA is a great computer but I want to be prepared in case I need to run some program on my laptop or if I need to design a program for my research in something like C++ or visual basic (or if somehow I end up doing computational work haha). I understand some of these questions may be arbitrary but I would like to hear a few other opinions on what you think would suit my needs best. Thanks for your help in advance everyone!