Same boat here. I believe every person collects in a different way. In my case when I buy a watch I try to pick something that (at least in my mind) is a novelty for the collection. Sometimes is obvious to me but not so evident to others. I love the moonphase complication (I have 3 of those). So in one hand I think well the 7787 brings an enamel dial to the stable and complement the guilloché dial of my other Breguet but in the other hand I think is a dress watch like like my Saxonia Thin and I have already a moon phase complication in my pp 5146g. Then I think yes is true but the array of the complications in the 7787 is very unique. Then mind switches to the Tradition 7027ba "mood", and think well I don't have nothing close to a skeletonized dial (I know tradition is not a true skeleton, they actually added stuff but you know what I mean) and it's so Breguet a "la Marie Antoniette " . Plus you get to see all the action in the dial.