The Samsung NC10 is pretty highly regarded. though what that means for the model your dad has seen, I don't know. Otherwise, you're probably after an Asus eee, preferably one of the ones with Windows on.
Casting a quick eye over the specs for the 130 suggests it should perform very well.
The NC130 is a slight redesign of the NC10, which I have and am very happy with.
£150 is crazy cheap! I've seen them for £230 but that's an absolute bargain. I paid £299 for mine back in February and still believe it was great value. Do you have a link?
At that price you might want to consider upgrading to 2gb of RAM as well, as it's only £20 and will help with Windows 7 if you want to go that route.