I'm a graphic design student. I want to buy a MacBook. However, I'm not sure which one to buy. I'm unstable between these MacBooks: - MacBook pro 15 inch Retina Display. - MacBook pro 13 inch not retina display. - MacBook air 13 inch. I want a Macbook that I can use Photoshop, illustrator, etc. easily with a high performance that the MacBook will not slow down and will not heat when using it long hours.*Which one is best for me as a graphic designer?* This MacBook will be my first. Waiting your help thanks.