I'm not a fan of Apple McBook Air though I really love how thin it is, performance wise, I would go for other brands and Toshiba is one good brand for your needs. You could check this ]Toshiba Portege Z930 Ultrabook which could compete for portability with McBook Air.
Yep. Toshiba Portege Z930 Ultrabook is awesome. Im not a fan of Macbook myself.
I also reccomend Asus Zenbook Prime UX31A (a lil bit more expensive) and also Gigabyte U2442 Ultrabook (pretty good for gaming)