Hi,
WERSI is effectively a builder of luxurious keyboards but so expensive.
You should be interested in the builder KETRON who, in this same spirit, commercializes keyboards more accessible but nevertheless serious.
The SD1 is the typical example of it and some go even compare him with products WERSI on many points.
You will find subjects of dicussions "in French" on this product here : http://fr.groups.yahoo.com/group/france-ketron-club/
Web : http://www.france-ketron-club.fr.st/
Best regards
FKC