Get a 2000 or 2100 for sure. I've got an MP100 and an eMate, but they're not nearly as usable as the MP2000 or 2100 I've got. The eMate DOES run Newton OS 2 which is nice, but the thing is bigger than it looks and has the slower CPU. I think a fair price for a 2k or 2100 is around $60 these days. Look for one that has the stylus and a good door or case. They're nice add ons that can get expensive if you try and buy them separately later on.