For the record, I'm going to talk mostly about laptops that have little to no gaming capability.
I am an admitted Mac hater but I will say that the MBA is arguably the best in its class of "ultrathin, ultraportable". For comparison's sake, the Samsung 900x3a is a Windows laptop I would put in that category. As ultrathin+ultraportables are emerging technology almost all of them are, in my opinion, too expensive to warrant any advantage in specs (the advantage in specs for this class of laptops being the solid state drive, which, might I add, is too expensive itself).
This doesn't mean that I would recommend the purchase of a MBA or a 900x3a though. MBA and 900x3a are laptops that, yes, have i5 processors, but they are ULV processors. It's much more economical to purchase a laptop based on a standard voltage processor at the cost of maybe 0.5 lbs of extra weight and of course the thinness. For that cost you will probably get about 1.0 GHz more processing power per core at a better price.
Besides MBA's however, essentially every other Mac computer is crappy and overpriced. For fun, my laptop (Toshiba Portege R835-P55X) compared to a Macbook Pro of roughly equivalent specs has:
- Same processor
- Same RAM
- Roughly comparable integrated graphics (both bad)
- Twice as much storage space at same RPM
- Same screen size
- Weighs more than 1 lb less
- Costed $400+ less for me personally out of pocket, $300 less for people who use no coupons or anything
I really don't see the point of getting a Macbook Pro at all. Any durability argument should be thrown out the window because durability of a computer is almost always based on the user's handling of the computer. The only slightly good argument I see for the MBP is maybe the argument that the film editing software is better (Final Cut Pro, for those that don't know). Even then, switching between all those codecs is a huge pain in the butt. Anyway.. In conclusion,
MBA: Get if you care a lot about the looks but not so much about the performance.
MBP: The only reason I can see that you would purchase this one is maybe if you were absolutely terrible with computers and had to reformat every time you got any type of malware on your Windows computer.
Sony Vaio: In your case the Vaio probably offers the most price : performance ratio. And I'm pretty sure it has a backlit keyboard.
My laptop: Even better price : performance ratio