Considering the watches you have, you could perfectly add both, Aquanaut and Calatrava, as they would complement nicely the existing ones.
In the Calatrava range, I would also have a look at the 5196, it could fit your wrist better than the 6000 and you can play with different straps to dress it up or down, IMO It's a very versatile watch.
The Aquanaut is something totally different, versatile as well but always with a sporty touch. Unbelievably comfortable and a joy to wear, intended initially for a younger audience. As others said, you have the 5167 and the 5165, and one of them will fit your wrist perfectly for sure.
If I were in your shoes, I would try them on with different outfits and would buy the one that sings to me the most. Sorry, but I'm not an impulse buyer, so my advice is that you take your time and try to make the "right" decision (to you, of course).