Apples and oranges really. If you want simple browsing and email then any netbook will be fine, especially if you can get one with windows 7 starter edition. If you expect Excel, Powerpoint, PSP, etc to run well you'll be disappointed. They're called netbooks and are comparatively cheap for a reason I'm afraid - they just don't have the grunt of a pukka notebook/laptop.
ETA. Battery life varies a lot though. I like the baby Dells but they have pretty woeful battery life - I just bought a car charger so I can keep it topped up on the move.