I have the stock 13" 2015 retina, and it is fantastic, but bear in mind that it is my traveling setup, as I use my big rig where I can. I don't think you can use the MBP as a main workhorse unless you spend the extra 1-1.5k on additional hardware. I love the portability of the 13", and I use the CC suite on a daily basis. For me, using Premiere, AE and Photoshop, I couldn't justify the cost for just an extra 2"
What school are you at?