I still think my money will be going on a Lenovo X240 with touch (12.5" screen) when it's released.
I honestly think for me I would use the surface more as a ultrabook and would want a solid good typing platform (a type cover on your lap still isn't the same as the solid base of an ultrabook on your lap when it comes to stability), more than I'd be wanting the extra portability.
Ideally I'd like both but, maybe I'll settle for the X240 and a second hand surface pro.
I honestly think for me I would use the surface more as a ultrabook and would want a solid good typing platform (a type cover on your lap still isn't the same as the solid base of an ultrabook on your lap when it comes to stability), more than I'd be wanting the extra portability.
Ideally I'd like both but, maybe I'll settle for the X240 and a second hand surface pro.