Itching for a new netbook

I've stopped lugging my laptop around with me when i go out. It's so darned heavy though it's only a 13.3" model. Moreover, the battery died long time ago and it's costly to buy a new replacement battery for it. So, it's a useless machine unless i take the power cord with me. I think it's time i move on to netbooks. They are small and light. With cheap computer memory these days, i can even upgrade them easily. Just great for people like me. The thing is, i need one that has long battery life and i still have yet to find one that's economical yet has long battery life. Any recommendations?