Looking at the photo of the Citizen Pro Diver, it occurs to me that for some, perhaps THAT is the Grail. And you've moved on from it (which sort of means it wasn't the Grail???). And someone might buy it from you because it's THEIR Grail at the moment. And will the Tuna be a final stop? I don't think it will be. Does the goal post keep moving? And how does this relate to interpersonal relationships? Or even "the Grail of people?" Starlets always seem to be replaced by other starlets. I liked Megan Fox, but now I like Emily Ratajkowski better. I don't want to have a Grail of watches. I want to be satisfied wearing any number of the ones I own and I don't want a watch that will make me stop wanting others. But I don't feel that way about Emily Ratajkowski.
While I'd love to get a $1,700 Oris Aquis 46mm Diver, I have to say that for me the Grail does stop at the Tuna. I cannot sustain my watch addiction now that I've arrived at the one thousand dollar Tuna. The watch will sate my desires, or so I believe. There is a precedent: I filled my house with high quality radios a few years ago and I no longer accumulate them.
Another point about the Tuna: I will probably like it so much that buying more watches will be giving the Tuna more wrist time competition, a state I want to avoid.