Everyone has his / her own prefrences so you'll get a different answer on this depending on who responds. What will you be using the keyboard for ? Live work , studio work, home play ?
I can only tell you my preferences. They may mean nothing to you or anyone else here.
I eliminated the 2100 for myself because I don't like the key feel. It feels very soft and unresponsive to me. It doesn't bother some of the other players here as much or at all.
Key feel is the main reason I no longer have a PSR2000. I like the styles better on the PA80, but it only holds two fills per style and I think the fills match the styles better on the Yamaha. Sounds are subjective too. For me the 2100 wins on pianos, acoustic guitars, sax and brass patches, and winds / flutes. The PA80 wins for me on electric guitars, organs, drums, bass, and synth patches. Strings are good on both. Someone else might think the opposite, and really, both have good sounds in most areas. Even for me, some of this can change at any moment given the mood I'm in and the mood of the piece I'm playing.
I like the OS and interface of both, but prefer the PA80's a little better. from what I read here, a majority of the participants on this forum do not. I like the editing capabilities of the PA80. It's a good bit deeper than on the 2100. Many users here don't care very much if at all about this. The 2100 has a harmonizer that most people seem to find to be more user friendly.
Support ( extras .. styles.. software.. etc ) is good for both boards, but the 2100 wins hands down here.
Your best bet is to prioritize what you are looking for by assessing what you plan to do most often with the board. Then take what you might get here and if you can, it would be a good idea to spend some quality time with both. Good Luck
AJ
[This message has been edited by Bluezplayer (edited 11-29-2003).]
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AJ