Starkeeper,
I think the PF1000 is a PSR2000 with 88 hammer action keys and a better sound system. In the on-screen demo I noticed it refered to itself as a Clavinova, even tho it is not 'officially' in that line. My friend paid $3000. I know Clavinovas can go for a lot more. As far as the piano chip goes, I'd say it is identical to the PSR2000 piano, possibly the same as the 2100...not sure, since I was not able to do a true comparison in a noisy store. The only way I could do a true A-B is to take my 2100 over to his house.
I personally own a Roland KR-7 digital piano.(see my review at HarmonyCentral) I must say the Roland and the Yamaha are both great-sounding. If I had to do it all over again, I might have purchased a Clavinova instead of the Roland KR-7. I can live with either piano chip on either unit. I think the Clav has better styles and voices(strings, organs, woodwinds - I love Yamaha's sop.sax) And one thing that really impresses me with Yamaha is the extensive online support for their keyboards.
But I'm stuck with the KR until its paid off...and that's OK with me. I'll NEVER find the PERFECT keyboard. There's always a trade-off in some feature or other.
I guess that was a long answer to a short question. Sorry for the rambling.
Tim
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Tim Schaeffer
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YAMAHA CVP-509 / Korg Pa300