Thank you rgtaa for your answer.
I have listen the PSR 9000 and I think too that his sounds are very beautiful.
I just want to have informations about how are considered the others kb (GEM, Technics, Ketron) by musicians.
For example,here in Brussel, is it very difficult to find a GEM WK8 or a Technics.
This is not a problem with the Yamaha or Roland.
So it not ease for me to have my own opinion.

Anyway, thank you for the adresses where I can find PSR styles if I buy the PSR9000.

STAM.