That’s a wonderful selection as it is, some fairly serious watches already in the box! Congratulations on your retirement too, 32 years is well and truly enough.
I think I would struggle to add something to punctuate the end of a career for sub 10k, given what you already have on hand. To me it would feel a little lost amongst the others of similar, albeit great quality watches.
Solid gold would break it up a bit and is traditional for a retirement watch, but they’ll likely push that 10k budget quite a bit higher depending on which model you’d like.
If that’s the case, maybe sell your least worn watch or two and add to the budget, or mull over it for a little while whilst you figure it out, you’ll have plenty of time. Being retired just earlier this year I tend to wear less of my collection as it is, so I tend to reach just for my favourites.
It also felt like quite a rush at the end of work, I really raced out there the first week to find what I was looking for. You have all the time in the world now to go on a hunt.
I settled on the new Ed White 321, it has been a perfect watch that could also suit your collection as it is, not too far of a stretch from the budget that you currently have allocated if you can find one close to retail.
A solid gold Constellation or Speedmaster could also be incredible, just looking at a few beauties now on Chrono24, I don’t often ever look at solid gold options but there are plenty.
Either way it’s a great position to be in, there’s nothing more enjoyable than researching and chasing down a special piece. Good luck shopping and building that armour, it looks epic.