I fought with myself for months whether to go MacBook 13" or MacBook Air.
I decided to go MBA because of the thinness of it and weight. Then I got a 17" macbook pro and realized that the MBA's screen is non-glossy and it makes a huge difference.
7 Hour battery life isn't important on the MBA.
optical drive I never use
Firewire or optical in, nah.
dedicated GPU, nope don't need that either.
2.5Ghz CPU would be nice but 2.13 w/ the SSD makes this machine faster (sometimes) than my 3.06Ghz 17" Macbook Pro w/o SSD. Honestly, launching apps can be faster on the MBA.
so between MBP & MBA, i think MBA is just better (if you can afford it). You lose a few features but they're not killer features and in return you get a notebook that's ultra thin and super portable.
I just wish the ports were more accessible. I've had bad luck with peripherals not fitting.
See and that's the difference for me... the RAM is that important, and I didn't have the SSD version. When I got my MBA the SSD was $2000 plus. I needed the extra power, and the extra battery life. Even with the brightness a little higher to compensate for the glass screen I still get a lot more time out of this thing. I've been lightly using it for the past 9 hours (it was asleep for about 1 of those hours) and I still have 11% left... AMAZING!!
Technically the MBA's screen is glossy (in that it's not matte), but by comparison to the glass on the MBP it is much less so.