I can appreciate and respect that he is his own person, but especially given the finance world he is going into, there’s no reason for him to compromise/eliminate any particular brand. As such, it’s not unreasonable to consider a Cartier from the Santos line since there are pieces that do double duty as elegant as well as masculine/strong design features that seem to reflect his persona. Otherwise, of the pieces you mentioned, the GO is indeed an impressive offering. I like the IWC and Omega too, based on photos. Ultimately, it’s an excellent and well deserved gift, congratulations in advance.