Going back to college in my old age and need a laptop. I'm in love with the retina display so I was thinking of the 13 or 15. The 13 is obviously the "better" choice for portability. Fits on desk better lighter in backpack etc. But I can't justify paying 2k plus for a laptop with no dedicated gpu when the 15 can be had for around the same price. So my question is.. Anyone use a rmb 15 for school? Carry it everywhere classes etc? Thoughts? Thanks