I tried the D6 The Pianet M, Kawai EP 608 and the Pianet T.
Most: well obviously! And easy!
The report price dpend quality of what you buy. Being given that these models are no longer manufactured for over 20 years and 40 years for some models! The prices are a little "free" tell us ...
Between 400 and 500 will have, beyond a becomes too CHRE.
I've seen ads for Pianet M 900! The Me, I prefer the price to try to find a D6!
With experience I will ever be the choice.