Hello everybody! I am a graduate student that does a lot of reading, writing and video-watching in his laptop (6-8 hours a day, my Ph.D. deals mostly with text and film). I currently have a 14 inch Sony VAIO -almost five years old- and I was thinking about getting a RetinaMacBookPro. In addition to these tasks, I would like to be able to do some light gaming. Mostly FIFA 15 and Pro Evolution Soccer 15 On Line, but also Diablo 3, Sim City, CS:Go and Civilization V. (Sports, RPGs and City Builders are my preferences in that order) I am not a huge fan of graphics neither someone you would call a hardcore gamer, I don't need to see every bit of detail in my screen, but I would like a nice playable experience without lagging issues. I am between two set ups, both with apple care protection plan: 13-inch MacBook Pro with Retina display 2.9GHz Dual-core Intel Core i5, Turbo Boost up to 3.3GHz 16GB 1866MHz LPDDR3 SDRAM 1TB PCIe-based Flash Storage Intel Iris Graphics 6100 Force Touch trackpad Backlit Keyboard (English) & User's Guide and 15-inch MacBook Pro with Retina display 2.5GHz Quad-core Intel Core i7, Turbo Boost up to 3.7GHz 16GB 1600MHz DDR3L SDRAM 1TB PCIe-based Flash Storage Intel Iris Pro Graphics + AMD Radeon R9 M370X with 2GB GDDR5 memory Portability-wise, I have measured my current laptop and compared it with the 15 inch rMBP, and the rMBP is only one centimeter bigger in length and width -and a lot less bulky and heavy, so even though the 13 inch is more portable, it's not like I would be getting something much bigger. But I still cannot decide between the two, mainly because I don't know if the dedicated GPU is needed for the things I wish to do or if I am overkilling. Also, for the money I would be putting on these machines, I am expecting a lifespan of 6-7 years. Too much? Last but not least, would improving the CPU in the 15'' bring significant power enhancement? I have read that it does not in the 13'' model. What do you guys think? Thank you so much!