I'm having second thoughts about which version of the retina MacBook Pro to order. I know I want the 256GB model with 16GB RAM, but am unsure about which CPU to choose - the 2.4GHz i5 model or the 2.6GHz i5 model. I know I don't need the i7 model. My usage is not really going to be that heavy, no video editing or anything like that, but I do usually have a lot going on at the same time on my laptop. A lot of windows open and system apps/addons running in the background. The main thing I'm looking to do is "future proof" my purchase. I know there is no such thing in technology, but I'm looking to keep this computer for about 5 years. The difference is about 120$ and both the CPU and GPU are clocked ~10% higher. Would this affect my experience and/or the longevity of the machine? Any opinions would be greatly appreciated.