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ThinkPads are worth looking at.
Specifically the 3rd gen X1 Carbon as a Mac Air alternative:
http://shop.lenovo.com/gb/en/laptops/thinkpad/x-series/x1-carbon/And the 4th gen X250 (launching next month) as a Mac Book Pro alternative:
http://shop.lenovo.com/gb/en/laptops/thinkpad/x-series/x250/Yes, they're black... but well thought-out black. The design comes from Richard Sapper who is as important in industrial design as Ive is (more so perhaps, Sapper's reach has gone way beyond technology), and is based on the Japanese Bento box... hence the black, the red accents representing the lacquer.
The machines themselves are incredible, and unlike Apple you can buy next-day on-site warranties... no taking stuff to a Genius, they come to you and fix things on the spot.
I'm about to ditch my Retina MBP for the X250.
It honestly hadn't occurred to me to look at anything other than a Mac. I have to love the object, it's a curse.