Roberto,
Very nice analysis and thank you for taking the time to putting these thoughts together.
Taking into consideration the various constraints (current collection, manufacturing, cost, etc), some choices in no particular order would be:
1. either Aquatimer for the reasons you stated
2. a vintage Inge which I had not considered until reading MF's very attractive specs in an earlier thread (made me consider despite already owning one)
3. a pilots watch - possibly a Mark - after all this is the year of the pilots
4. a white dial vintage Portofino in SS (this may be borderline wrt cost)
5. an (affordable) Siderale - the ultimate forum watch! How is this for Sci Fi? :)
At the end, the biggest attraction the way I see it comes more from what this watch represents being a collectors' forum watch and I'm confident that the powers that be will make a very thoughtful choice.
Cheers,
Evan