For the price of a new 13" MacBook Air you could buy a PC now, save the $500 and buy a new PC in 2 years. I've considered buying a Mac, but I can't think of a single reason to do it other than the fact that they're a little lighter.
Portability+better battery life is a major concern as a student, and they remain usable longer than PC's. Backlit keyboard is standard. tend to have fewer crashes (my current computer turns itself off at inopportune moments).
also unusual- my current pc doesnt have a cd drive and I have no need for one.
I do love the backlit keyboard! It was a tough decision for me when I decided to do it, since i have never had issues with PC's not lasting, etc. but went for it bc of size/portability and other features... I do have a lot less issues with mine than dh has with his HP, which is why we went w lenovo this past time for him. It really just depends on what you need it for/want to do with it, I guess.
Also, with StateFarm they have this option to pay $30 a year to cover all issues of breakage, etc. except hardware malfunctions including theft and they'll replace the whole thing (at the cost I spent on it), so that helped make my decision easier.- (this would have been the case with any laptop though, but it just made me feel better ab buying it)