Nice collection. I have a segment in my quiver of 12 that looks similar. I guess the next watch(es) would be based on your lifestyle.
If it was me...I would need some rugged dailies like I currently have, BBB, Muhle Sar, and a beater or two; I have a Gsar and Monster.
To continue your current theme, I agree with others that a chrono, maybe a black and a white or maybe even a blue would be a fun change up.
If you travel abroad a GMT or two are nice to have in the mix.
edit: oh, and don't concern yourself if it does or doesn't look like every other collection on WUS. We all only wear one at a time and you will never meet the other guys anyway.