I'm a BIG Hermes fan - however - I do feel that a nice watch is an excellent staple for anyone to own - particularly if it's gold.
My thought on the Cartier is that it should be given to you buy someone you love, to either celebrate your love, or a special occasion. Yes, it has become a fashion piece, but, perhaps save the Cartier for a special occasion?
It's much easier to get a good deal on preloved Cartier and Rolexes, however, it's a toss-up with preloved Hermes. There are plenty of things to look for, and there is plenty of advice about this in the Hermes sub-forum.
Would the Kelly be something you would feel comfortable wearing regularly? I imagine the Rolex or the Cartier might ... Something else to consider.
Also consider - you'll probably end up buying all of the above over the next few years (I understand your dilemma all too well [emoji6]) ... What can wait? What does your heart of hearts yearn for?