The PF1000 has a tripple sampled acoustic piano which is not in the PSR2100. The interface and sequencing is just like the PSR2100 but the polyphony is a bit wierd because you don't have the full 64 voices like the PSR2100 but more like the PSR1100.
Yamaha has just come out with a new digital piano. I got them in today. They look just like the P80 but are called the P90 and they have the triple sampled piano and all the other sounds of the PF500 and the P2250 piano. This new piano sells for $1295.00 list and a street price around $1095.00. A killer combination would be a P90 on the bottom and a PSR2100 on top... And the price would be less than the PF1000! Although the PF1000 is nice, most of my customers don't like playing the organ sounds and strings, etc. on a 88 key hammer action so having 2 keyboards and spending around $2400.00 for both rather than the $2795.00 price for 1 PF1000 is probably for most a better way to go.
George Kaye
Kaye's Music Scene
Reseda, California
818-881-5566