I currently in a dilemma between an air i currently have or a 13" retina I will buy in exchange for the air. Basically the retina is turning me away because of how people are saying the 13 inch barely runs the computer well. After that it all comes down to do I want to spend an extra $500 on a retina? At this point is a $1,100 Retina vs $600 Air. I spend a lot of time on the laptop and do occasional photo editing when I actually have pictures. Most of the time I spend is coding since i'm a Comp Sci major so there will be a lot of times staring at the screen. Any opinions?