I'm trying to conceive of reasons to go with the discrete GPU-less 15" rMBP. The reason is obvious: I wish to save money. I'd upgrade the RAM to 16gigs, since I'm a graphic designer by trade. That's about it. Ok, so my basis for believing the Iris Pro only 15" is better revolves around durability and heat. I feel one of the common causes of a death for a computer is a bad video card and more heat is never a good thing for a notebook. Am I right for assuming the average lifespan of the base 15" is probably longer than the higher-end model with the 750m? Don't get me wrong, if money were not an issue, I would have gotten the higher-end model a long time ago; but, naturally, money is an issue and am I right to believe this is one (lone) advantage of saving money and going with the base model?