Hi! I'm new to this site, and seeing I have several questions regarding the MacBook, I thought this would be the place to start. I am about to purchase a MacBook Pro, and being I am not technologically savvy, I'm not sure which features I should pay to upgrade, and which I should leave alone. I know for a fact I am purchasing the MacBook Pro 15" with Retina Display. I will be using the MacBook for my undergraduate degree, (which I'm majoring in Biomedical Sciences), therefore I will have several biology, medical, anatomy & physiology, and math classes. I also plan to use the MacBook for Medical School in a few years. I also plan to use the MacBook for personal use, storing my iTunes library, pictures, etc. but also want to have room for all of school papers and documents without the risk of running out of space. SO.... Should I upgrade the processor from 2.7GHz to 2.8GHz? Should I upgrade the 512gb of flash storage to the 768gb? Thanks so much for everyone's expertise!