You should note that MS OFfice IS available for free on Android devices (including the Chromebook)
See here http://www.greenbot.com/article/2127781/microsoft-office-mobile-for-android-is-now-free.html
Fairly recent and not particularly well advertised, but pretty brilliant i think?!
Given your requirements, I would look for either another netbook or a 11" Google Chromebook.
The advantage of the Chromebook is a brilliant screen, fast startup, long battery life, size, coolness :D
http://www.google.com/intl/en_uk/chrome/devices/hp-chromebook-11/