I'm looking into getting a laptop this summer if I'm able to get into an REU. I was looking at macbooks, just because they are reliable, have long battery life, and still has the power I need for programs like Mathematica or Sage, since it will be used for research, the computing will probably be heavier than your average calculus class. Can anyone speak towards the price vs. performance between the newest 13.3" Pro vs the previous model or the 13.3" air, or even previous model air? Basically I'm looking at 4gb of ram and 128gb ssd. All models I'm considering have the 2 core i5, different generations, obviously. Keep in my mind, this isn't a question about Mac vs PC price vs performance. I know I could get a much more powerful windows laptop for the same price. My main concern is reliability. I need this laptop to last me through my program, my last academic year, and then most of the way through grad school. So at least 3 years.