Why not get a used iBook? You could get a used one for next to nothing. A G4 would more than serve your purpose. Even a G3 would be fine.
I'm seriously considering a clamshell ibook. They're under 200 on ebay. Any more opinions on these models?
The last Revs were 12"/1.33GHz and 14"/1.42GHz
Still speedy for today, and the 14" screen would be easy on the eyes (although I own an iBook G3 12" and I don't have any issues with the screen, it does however take some getting used to)