Thanks to all for your help.

I can see you rank first 9000pro, VA series, and KN65000.

And Roland KF-90, but I think this one plays in another ligue... So,

-Is KF-90 a lot more priced than VA7?
-Is it really much better than VA7?

Yesterday, I see and played PSR2000. Nice kb, but piano voice likes a little weak when listening it by internal loudspeakers or earphones. So,

- It will sound much better, more real (nearer to 9000) with an external amplifier and external loudspeakers?

Thanks, your are very nice and helpful people all of you.

Bluebird