If you're wanting to do some surfing, watch YouTube, etc., then anything older than a G3 is not for you. Even with OS 9, your browser choices are pretty limited and time will only make that more of a problem. I recommend getting a Pismo and putting OS X on it.

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These days for a 'proper internet experience' you need at least OSX to access flash and other plugins. iCab is good and the old Mozilla is ok but only for basic surfing. Youtube would not work on iCab or Mozilla when I last tried it even with the latest flash that I could find for OS9.

A Lombard with max ram would be good for OSX or a Pismo. Alternatively a cheap clamshell ibook as well however most iBooks are known for a problem of some kind.