Hello guys! I wanted to buy a 15 inch MBP because my MBA's not power enough. I was confused about these two models. The Retina has a gorgeous screen with less reflection, SSD and it's lighter and thinner. The regular has more storage, SuperDrive, it is upgradable (I can save money buying the cheaper one and putting 16GB of RAM and SSD if I want) and it is 400 less. What should I buy? Thanks.