Really nice collection, well done! I like the variety of brands and specific styles, there is good range in there.

A brand that does some really interesting pieces, extremely good value for the money, is Louis Erard. I would check them out.

I’d also consider some higher horology pieces as your collection grows. A. Lange, H. Moser, and others. A Lange 1 or any of a variety of the Moser pieces would complement your current collection nicely.

Finally maybe something green? There is a lot of different green out there. I recently got the JLC Polaris Date in olive green. Outstanding piece if you can track it down and seems like it would fit your style.