If that's really all you're doing, I reckon the 12" iBook would actually be perfectly adequate for your requirements, ditto the 14", and any Powerbook would be a delight. The screen on a 14" really isn't that bad either, I just don't think you get that much extra utility out of the bigger screen, provided your eyesight is OK. Remember also that you can plug the 'book into an external monitor to get a bigger and higher quality display when you're at home.
Whatever you buy, remember: Buy as much RAM as you can afford. It's easily the most cost effective and, well, effective upgrade you can do. If you're even moderately comfortable with computers, don't buy it from Apple — you can get it much cheaper elsewhere (Americans seem to favour Crucial, so far as I can tell).
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