AP - had a couple of Oaks in the past, difficult to add anything now due to limited supply. Panerai - I do have three, but these do not make it in my top 12. Longines - it all started for me with a Longines Grande Vitess chrono in 2011, sad not to have it with me any longer. Omega - had a lot of modern Omegas, really regret selling some of these pieces. Same for IWC and JLC. Parmigiani - really intrigued by some of their new Tonda thin integrated bracelet options, may be getting one of these eventually.
Zenith - this is a new brand for me, but I was impressed with the quality and design so added three in a short while.
Journe Chronometre Bleu would make the most sense, since I am missing tantalum in my set, but really impossible to get one nowadays,
Omega CK859 is an absolute hit. I know I will not be able to resist if I come across it live in a boutique.