Hi Bill "BEBOP",
I can`t advise you on the "Yamaha`s" your looking at as I have the Y2K, But at : www.music123.com you can get a 9000Pro for $2739.99 (free s/h) not sure about "tax". If I was to get another KB I think I would "pass-on" "Yamaha" although I`m "kind`a-like`n" the Y2K, the build quality just is not there. It sounds great all "Yamaha" KB sound great if they could just add quality to there sound I would be a customer for life. The "Wersi-Abacus" is very.... "pricey" and I have no absolute knowlage, but they "look" like a fine KB and the spec`s are good. But if they don`t sound as good as "Yamaha" it could be a mistake. Also if you have a chance, "check out" the new "Gem-Genesys" when George Kaye get back. If you don`t need it right away.
Best of luck with whatever you chose.
jedi