Can any psr user tell me if there is any difference regarding voices/styles between the new psr2100 and the old psr9000?

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YES,,,,,,,,,,there are numerous diffences. The session styles on the 2000/2100 are all new. Many sounds are also new. The entire operating system is different. I prefer the 2000 series over the 9000 and I've sold both for years. I also dislike how heavy the PSR9000 is compared to the 2000 or the 27 lb Tyros (which is actually the replacement for the 9000).
George Kaye
Kaye's Music Scene
Reseda, California