Sigh, I was really disappointed at the price of the new retina.. Now, vs 1600 (student), I can get a macbook air at 1150 or 1250. The only difference between the two is 4gb ram. Is it worth a 150 difference? (amazon has the 4gb model for 1100). My inclination is yes... because I am taking a hit to the processor by opting for a 1.8ghz i5 vs the 2.5... I am a future grad student btw.. also what do you envision will be limiting if I get the air vs the pro?