Hello, Trying to determine if it's time for an upgrade. A little bit about what I do and what I have. Currently only using my computer for casual browsing (email, eBay, documents, pics, music, etc.) and gaming (Diablo 3, Starcraft 3, World of Warcraft, Guild Wars 2, etc.). What I have: Macbook Pro 15" early-2011 model. 2.2 GHz i7, 8 GB Ram, 750 GB HD, Radeon HD 6750M 1024 MB, normal screen. What I'd get: Macbook Pro 15" late-2013 model. 2.3 GHz i7 with turbo boost to 3.5 GHz, 16 GB Ram, 500 GB solid state HD, NVIDIA GeForce GT 750M, retina screen. Is it worth it? Is there that big of a difference in the video cards? I play my current games and what not pretty easily but they are all on low/medium graphics and there is occasionally the noted lag. Any help with this decision would be greatly appreciated. Thanks!