Ok thank you to everyone for your advice. I think I will get the $1200 13 inch MBP but I'm going to upgrade the RAM to 8 GB. I'm glad there are people who actually try to help others in this world.
Man, you're letting the haters in the forum get you down?
You're buying a laptop to serve you for the entire 4 years of college, and possibly time after that.
Do you want to get a laptop that is the first of the next generation of tech, or the last of last generation of tech?
I know I sound like a fanboy on this, but in 5 years when all laptop displays have resolutions around 2880x1800, you might be looking at your old 13" with 1400x900 and saying to yourself "I wish I had thought ahead and bought the 15 inch retina"
And for portability - the 15" rMBP weighs the same as the 13" MBP. Not too much difference there.
I know that when I bought a laptop before college I went for the 'reasonable' option instead of the one I *really* wanted, because of a $300 price difference, and I've regretted it ever since.
If you're making a purchase to serve you for the next 5 years, buy with your heart so you can take pleasure in your purchase every day you use it.
Just my 2 cents
Let the downvotes commence