There's a gorgeous SS UN Marine Chronometre on bracelet for sale on TZ right now; $3500 and would be a great looking watch on a strap as well.
I like the idea of an older Zenith El Primero also; Zenith is a phenominal value for the money!
Though I also think a nice 16800 with original matte dial might be an option to consider too (gee, dunno why I would think that ).
Decisions like this are difficult as the choice of watch is purely subjective to the buyer; depending on if you want modern, vintage etc. there are a ton of options out there within your price range. However, if I were in your position, I'd keep your current favorite to wear as a daily, sell off the rest of the collection and save up to push your budget into the $10k - $12k range. This will give you something to wear while opening up your options even more.
Just my $0.02...