Just to chime in again on a couple of possible options
If not considering the "pure" netbook route....
1) One of the Toshiba Portege line - arguably the longest running series of Ultralights and very close to netbook size, but with better performance. Even better with a SSD.
2) Asus Transformer Prime. Keyboard when you need it, pad when you don't. Size of a netbook. Wait for the HD version in June.