Where to go next in collection

[Kliminator]

Hi everyone - thinking about where to go next in my collection. There's a big milestone coming up that I want to get a watch to commemorate. I currently have the following:

- AP RO 15450 (White)
- Rolex Ceramic BLRO
- Rolex YG DD40 (Silver Romans)
- Panerai Luminor Due PAM728 (Blue Dial)
- Rolex Tritium Sub No Date 14060

Some additional details:

- I am leaning towards something sport / steel in the $5k-$15k range
- I typically dress casually -- am usually only dressed up for a wedding or rare occasion of going to a show @ a theater
- I am fine sourcing from an AD or via grey market
- My wrists are on the smaller side (~6.3 in) so 40mm or less is typically the sweet spot / my preference

Some watches that have crossed my mind :

BLNR - Might be redudant as I already have a ceramic GMT. If I were to go with this watch I feel like I should go for the oyster model to switch it up. This would require me to for sure go grey as oyster isn't an option at AD anymore

Datejust 41 - Recently began thinking about this as a potential option

Explorer - 39mm is a good size, low profile / understated

Vintage Buckley Datejust - I've always thought these are insanely beautiful when seeing them online

Ceramic Daytona - A guy can dream, right?

Feel free to make a suggestion if there's something else I should be considering that would be a good addition to my collection

I've also explored the option of picking something up from another brand (GS, Lange, Panerai).

Appreciate the feedback!