What sort of thin and light laptop should I get?
I'm going to be going back to school in the fall to get my MBA. I am taking this as an opportunity to reward myself with some new hardware - namely, a new laptop. I'd like something thin and light, somewhere in the 12"-14" screen range, with a ton of battery life, and reasonably quick. Web, assignments, that sort of thing. So I'm more or less looking at ultrabooks, is my understanding. I've always been a PC guy, but a MacBook Air is at the top of my list right now. The only thing really keeping me from pulling the trigger is that I think the upgrade to 8GB of RAM is unnecessarily expensive (only $100, but that bugs me for some reason) - but it's a "do it now or forever hold your peace" thing, as the memory is soldered on.
So, I come to you. Is the Macbook Air what I should be buying? Is there a PC that I should be getting? Should I save a few extra pennies and move up to a 13" rMBP (an Amazon warehouse deal, I think I saw them for about $1200... maybe, pending warranty and all)?