I would like to see Lion on my laptop, I will probably give this a shot. I have SL on my M1530, and even that isn't 100% compatible after all these years of improvements. It is very close though.
I have a ASUS Zenbook UX31E, and I love it. I think it is a great Ultrabook. I read a lot of reviews for all sorts of Ultrabooks. Folio 13, Macbook Air, Zenbook, XPS 13, etc. The Zenbook has the second highest battery life, just under the Folio 13. The ASUS is much nicer than the Folio plus it has a beautiful screen and design. I went to purchase a Ultrabook and tested out the Macbook Air. The 13" is nice, the 11" is not so nice. The 13" is MUCH more expensive. And what you're paying for in the long run is the "apple look". Spec-wise it doesn't beat out the Zen or others. So I decided to go with the Zen. Plus I realized it was even a tiny bit smaller too.
My ASUS also came with a bag to carry it in, adapters for usb-ethernet and vga out, a bag for them, LCD cloth, and cable ties. The Packaging was also quite nice and impressive.
I spent $1000, and the macbook air 13" is $1299.00 so I definitely think I made the right decision.
Basically if you are a fan of apple products, and have money to blow, get the air. If you don't mind trying something new, and don't care about what OS you use, go for the Zen.
Final Note: This year a lot of Ultrabooks are coming out, so keep your eyes open for what is new and improved