You want a 2100 if you actually want to go on the web with it, as the lower RAM of the 2000 limits its usefulness there by way of serving up constant out of memory errors. The two are otherwise more or less functionally identical, though I know of at least one bug that the 2100 squashed that was present in the 2000. So there was some modest tweaking in the transition to the 2100 beyond the sheer RAM complement.
The 2000 might end up being $10-15 cheaper, but you might as well go for the "high end" at that price. If you watch and wait on eBay, you will find a good model for $40-70 from private sellers.
The key thing to watch for is the condition of the screen. You want one with no scratches. Along with that, you want the dongle (Newton Interconnect adapter) and all the case parts and stylus, obviously. But I would make sure of the screen's condition first and foremost, as once scratched, they are irreparable; the case parts can much more easily be sourced from dead units etc.
I have used a Newton (2000 for many years, then more recently a new-to-me 2100) daily since 1998. In that sense, it is the greatest of my retro machines bar none; the rest I collect but most I scarcely ever use.
The 2000 might end up being $10-15 cheaper, but you might as well go for the "high end" at that price. If you watch and wait on eBay, you will find a good model for $40-70 from private sellers.
The key thing to watch for is the condition of the screen. You want one with no scratches. Along with that, you want the dongle (Newton Interconnect adapter) and all the case parts and stylus, obviously. But I would make sure of the screen's condition first and foremost, as once scratched, they are irreparable; the case parts can much more easily be sourced from dead units etc.
I have used a Newton (2000 for many years, then more recently a new-to-me 2100) daily since 1998. In that sense, it is the greatest of my retro machines bar none; the rest I collect but most I scarcely ever use.