I'm about to buy a new laptop around June-July. The usage consist mostly of web related and office activities. Rarely I'd do some light photo editing as well. For the basic usage of mine the 13" model should be more than enough, but I'm playing Guild Wars 2, which I'm mostly worried about. I don't care if the game looks too pretty or not, as long as it does run smoothly and preferably with the screen's native resolution. Should I invest in tremendously more expensive 15" rMBP with dedicated GPU, or will I get by with the 13" model just fine?