I have been waiting to upgrade my mid 2009 macbook pro 15 inch. I use my laptop for study (word, excel, powerpoint, photoshop). I would also like to be able to use a macbook pro for gaming such as DOTA 2, CSGO, and Final Fantasy 14. I really want a dGPU for my gaming needs and the base model for 2013 doesn't have one. Do you think the upgrades on the 2013 high end model is worth 1000 dollars over the base model from 2012? Also, I am concerned that the base model of 2012 retina macbook pro only has 8gb of ram. Is there a big difference between 8 and 16 gb ram on the retina macbook pro? I am not concerned with storage and I could care less about battery life since I'm plugged in all the time. Lastly, is there a big difference between 650m and 750m? With this information, which macbook retina do you recommend?