I thought the PSR9000 just had some additional voices the PSR2000 didn't have, but many of the voices are identical. Of course, the PSR9000 has much better speakers. You might grow to love these voices. I really love Yamaha voices. You'll definitely love the hard drive and being able to get all of the PSR2000 and CVP209 styles in one easy to access place. But if you were really disenchanted with the PSR2000's voices, you might need to move on to another brand.
When I tried the Solton X1 after really loving the PSR740, I was at first really disenchanted with the Solton's voices. My friends here at the synth forum told me I should give the X1 a second chance, which when I did, I came to love the styles and voices. I got rid of the X1 for other reasons.
So Tom, you might get used to the Yammi voices and come to love them. You might really dig the superior piano and additional voices on the PSR9000. I hope so, because Guitar Center might get ticked when you make your second return.
I know you'll miss the OTS system that the PSR2000 has. Can you create OTSs for styles on the PSR9000's hard drive? or only with flash rom styles?

Larry