It's easy to get carried away and think that "better" is always better.
What I mean by that is, yes, the 15" rMBP is definitely the best laptop Apple offers. But who was it made for? Was it made for light gaming, word processing, occasional photo/video editing, and web-based activities such as netflix, reddit, facebook, etc? No! It was made for hardcore professionals who's lives/careers depend on their computer, people that need a machine that can compile and export a full length 1080p movie on a laptop without it falling all over itself, all while running more applications in the background. Will you be doing that at school? Highly doubtful.
People seem to think that just because a computer is at the bottom of Apple's gene pool it means it's not good enough. As a society we're trained to not buy the cheapest thing available because it won't be as reliable or whatever as the more expensive things. But this is Apple we're talking about, they don't make cheap things. Apple makes quality products all around, from phones to desktops, and their products never stray from anything short of fantastic.
It's easy to buy a $2400 computer and love it, but you never even gave yourself a chance to buy a cheaper one and see how you feel about that. For the purposes you use that $2400 one for, the cheaper one could perform them in the same exact way, and you would never know about it.
I game, I produce music through Logic and Ableton, I watch movies, listen to music, I take web-browsing to a new level of tabs and time wasted, I program, I handle all of my school work, I do all of that at a high resolution, and I use flash architecture. I achieve all of this with a 1.8GHz 2012 13" MacBook Air. Buzzwords you see in the "tech specs" of apple.com are made to draw you into buying the more expensive machines, but the lower spec'd ones aren't as low tier as you would think. They're not low tier at all, these machines are nothing short of ridiculous.
Try a cheaper model, buy it and return it a week later if you want, but from a junior in college to an incoming freshman: you're about to become poor, save your money where you can. Or blow all of the money you would have spent on the retina, get an air or a pro, and spend the rest on accessories like displays, appletv, speakers, storage, etc.
PS I switched from a 2010 2.4GHz 13" Pro to a 15" retina (for about a week) to a 2012 13" 1.8GHz Air. Guess which one is my favorite. Hint: it's the one I still have.
PPS Comedian Louis C.K. edited and produced the entire second season of his show "Louie" (Thursdays, FX. A show that is broadcasted on cable television) by himself with a 13" MacBook Pro. Will you really be using your 15" retina, a much more sophisticated machine, for more than that?