I am selling my ASUS eee pc with a 1.6 GHz Atom processor, 160 gb HDD and 1 gb RAM. It is currently running Windows XP, but you can put Windows 7 or whatever you want on it. I treat my things well, so it's still in excellent shape.
You can see the impressive specs of this netbook here. The battery life is particularly good (it's listed as 10.5 hours!)