Macbook Air 13". I love it. It's my first Mac and I realized I will never buy a non-mac laptop again. Yes, it's more slightly more expensive, but the quality is so much higher it's unreal.
Your $1200 buys you more than your $1000 for an "Ultrabook"
Our X-mas bonus this year at work was a MacBook Air. I've got a 15" Pro at work; and at home, a 24" iMac, a TabletPC, a Chromebook, a Galaxy Tab, and four smartphones (thank you, Google I/O). The Air felt a little bit like overload at first ("yay - another gadget"), but it quickly became my favorite of the lot.
13" is a great size (I don't miss the extra 2" from my Pro), and it's unbelievably svelte. If I take the bus, I just throw it under my arm - no bag, no charger - just my MacBook Air. It's plenty fast. The screen has great color, and will go as bright or as dim as you need.
Your $1200 buys you more than your $1000 for an "Ultrabook"