I went into Carphone Warehouse a year ago for a new mobile and came out with an Asus Eee PC 701SD all for £149. Running Windows XP and a Solid State :C\ Drive of 8GB it has been great for away from home email and web use.
I added an extra 1GB Ram to help it along. Just don't expect speed or multitasking. I have a stand alone CD/DVD unit so loading programs isn't an issue.
My ideal Netbook would have the same form factor of the 701SD (225mm x 160MM) but with a 10" display, the processing power of a top range laptop, using Windows 7, built in Bluetooth and priced at about £350!
Cheers,
Jim