That is an easy answer for me. I have even made the preliminary sketches :
13,99 m lenght (here you pay in the marinas a lot more for a boat over 14m);
Aluminium, for resistance against impact on submerged objects;
With variable draft, with a bomb ballast. Deep draft (2,50m) for very good upwind sailing, and short draft (1,40) to go almost everywhere.
Big initial stability and an AVS of around 130º, for a fast and seaworthy boat (big sail area).
A easy 8k boat with very fast and safe downwind sailing.
Versatile interior space with a small deck salon/pilot house space and a bigger interior salon, also with a sea view and confortable arm chairs.
A good galley with lots of space.
A dedicated space for the dinghy and the life raft, and lot's of other personalized features, like the geenacker extensible boom.
But unfortunately it is needed more than to know what kind of boat is the dream of each sailor
. It is necessary to have the means to afford it and after asking for prices I found out that one is out of my reach.
So my next boat and I would say my last boat will not be the perfect one, but some kind of compromise.