Thank you all,

Roel, Ionly have made the decision abouth the SD1. As you know I first have to build my new studio/office, so I need a second morgage!
Andrea, I didn't have the chance to play a Genesys but the size of this keyboard is unbearable to me so I don't want to see and hear it anyway.
The GEM Promega 3 at the other hand is the best stagepiano I ever heard, I love it.

Abouth the German site where Roel refers to, they also say that if you close your eyes you'll want the Ketron but if you just see the keyboards you'll pick the Tyros.
And that's the same what I meant to say, because music is something you're LISTENING at, not looking.