I just purchased the refurbished version of the 15in top end retina macbook pro. I have the 13in model now, generation before the mid-year bump, and since I use it for graphic design I just felt crammed with the 13in screen and felt like the lack of storage and being constrained to the dual core i5 was making me rethink the future proofness of my purchase. My brother has a 15in and I love the real-estate, his is an earlier model though that still has optical drive and non retina so its super heavy. Thoughts on this?