Thanks for all the hints and tips :->.
I cannot sell the Blofeld, i have developed some software for it that is still evolving and then will be need usual bug fixing and so on, so i need it handy. Also i like the sound and it is perfect for my composition oriented studio set up.
To go back to the roots of my need (more for me to make my thoughts structured than for asking help : for many years i have been a Cubase composer (actually, started with Pro24, with a TX16W and a TX802 and a M1000, last is still there . I have been quite happy with the results, been an amateur. I even made the music of a documentary (good ties with the Executive Director, my wife and some music for a friend short movies. Mostly electronic stuff in the german 70s style (with my own twist) and later some minimalist acoustic stuff (never really performed by real people, even if i tried hard at a given moment).
In 2002 i found a great Jazz piano teacher, that took me for what i was and helped me going forward with the piano; i discovered playing with other people, and slowed down computer composition (that is lonely, and lacks adrenaline, but it is still good .
In the last couple of years i have been thinking on how to marry the two sides of my musical personality; looking at the Mehliana duo on youtube was a shocking revelation :->.
So, what i am really looking for now is a synth that can actually be played as an instrument vs programmed as a computer. A synth for which i could fully grasp, and that i can interiorize and feel and connect to, even in its technical characteristics. A synth intended to be my second instrument after the piano. A synth i can use as a tool to look for musical freedom and expression and not to cover standard ground. Either that, or i drop the subject and start to study trumpet :->.
This imply a very good ergonomic. Probably some simplicity (even if the P12 gave me the impression that its complexity is not in the way of mastering it).
This imply also some character; an instrument must be inspiring, but does not need to be universal.
Than there are mundane constraints like money, space, weight. And less mundane one, quirky : if i can develop my software for it (i.e. enough sysex support), i can charge it on my IT consultant activity (even if this specific software will never pay for it , and solve the classical musical vs family budget subject :->.
This is how i get to the initial short list :->
Thanks for reading,
Maurizio