Hello there, I will use the computer for photo editing (lightroom + photoshop) as a hobby for now and web/safari/emails/movies(watch). My main concern is the graphics. What is the difference in real life usage if I don't game or do video editing of the 5100 vs 5200 in the 15inch. I was thinking getting the 13 inch 1499+16gb and connect it half the time on my dell u2713h. Would this be ok or is it a lot better the 15 inch? I will also probably run the rmbp screen at it's highest resolution. I want to keep it for 4-5 years and my current machine is early 2008 2.5 c2d mbp with 4gb of ram. thank you.