Hello everyone! My brother will be starting college this fall and I'm buying him a 13" Macbook as a gift, but I'm not sure which one I should get him. If Macbook Air, I'll be upgrading to 1.7GHz, 8GB RAM, and 512 GB SSD. And if rMBP, I'd get him the 13" 3.0 GHz and also 512 GB SSD. As I said, he'll be going to college, so he'll probably be carrying it around a lot. Is the Macbook Air that much lighter than the rMBP? And is the rMBP's retina nice enough to warrant the extra weight? Also, I've been hearing concerns about the 13" rMBP performance. Is this a problem for the upgraded version as well? Any insight would be really appreciated. Price is not an issue. I just want the better "fit" for a soon-to-be college student.