I go to NYU, just bought a MBP 13in, very excited! I love how well it works together with my 4S. Anyway, I will be taking the train to school, using a Northface backpack.... I will be careful but I would still like piece of mind for the precious screen while it is in my bag.. any recommendations for cases? there is a nice $50 one from the Apple store (I have a $100 gift card) but all of the reviews say the zipper breaks within months. Any help appreciated!