Sorry, I didn't mean that. I'd just be worried with an Air as my only Mac, seeing as it's only got modest main storage and it's not expandable, same with the RAM.
You'll be surprised how quickly you fill 128GB. Bear in mind that the OS takes up a 10GB footprint of that, plus all the pre-installed software on there.
If you have a lot of music, then that eats it up. Movies, even more so. I think I have 84GB on iTunes now, so if and when I get an Air, I'll have to cut that right back. Bit annoying IMO.