I will buy the MBA when it gets a backlit keyboard. I really like the small, light form but need to be able to see the keys in a dark room (or stage). The sales guy at the Apple store just told me to "crank the screen brightness and tilt the display down to light the keys".

Yeah, uh no, the last thing I need in the dark is a brighter screen.
It is one or two generations before the curent moddel, but mine has the SSD and the backlit keyboard. I couldn't live without the backlit keyboard....use it on night flights and in bed all the time.
I'd consider selling my 13" and getting an 11", but not till they put back the backlit keyboard. Can't understand why they did away with it.
You can sometimes find used ones on Ebay or in the Apple refurbished store.