I would get a proper laptop, not a netbook. I have found that everyone i have come across with a netbook thinks they are great to start with and then the moaning starts..... the screen is too small, its slow....blah blah...
If you just want if for web ONLY.... thats fine, but as soon as you start to install the odd program it will really start chugging. I would look for something like this http://www.ebuyer.com/285944-fujitsu-ah531-laptop-vfy-ah531mrsc2gb
I know its a little over your budget..... but as crimbo approaches you might find a bargain or two