Tough question, Fernando.
I think I would sum it to around 10 / 15 watches, a kind of blend of the nicest Vintage and Modern watches.
I would certainly get a selection which would look like something like this:
Panerai 6154, the epitome of strenght and elegance ala Italiana.
Tudor 7924, a brutal and very fine bad boy, and a piece of History.
Rolex 6542: The mother of all the Rolex GMTs, I never saw something more sensual than this one.
Blancpain FF ( US NAVY / Pakistanese or TR 900 ), a legend on the wrist.
AP: The very first R.O, an hybrid watch, sporty and dressy at the same time, difficult to put in words, exciting to feel.
GP: The Tourbillon with gold bridge(s): Timeless, precious, an intellectual pleasure and satisfaction.
Lange und Sohne Langematik Anniversary: One of the finest Lange ever made, and a captivating enamel dial.
JLC Master Minute Repeater: Can't get rid of it, a somptuous and crazy watch.
JLC Duometre à Chronographe, one of the smartest modern JLC.
JLC Vintage Deep Sea Alarm ( European ), a superb and curious Diving Watch.
U.N Freak, the mother of all concept watches, crazy, original, technical, a milestone.
U.N Sonata, the nicest Alarm watch combined to a friendly complication ( the GMT ) : THE treveller's watch.
PP 5110P. THE Reference in world time watches.
VC Minute Repeater skeleton: It will be the only one high complication I would double, without any hesitation, and with a great pleasure: A Masterpiece of Art.
I would also pick one Independant: De Bethune or K.V, but I still have to do my homework.
With such a list, I would say that I could not do better... I would retire without any regrets.
Best,
Nicolas.