I would look at it in terms of style. You want to present a variety, from sports watches to dressy tank style and everything in between. The big advantage to BP among those mentioned is that they have a strong line of high-end sports watches that is going to get much stronger with the new FIfty Fathoms. They are very wisely positioning the new FF to compete head to head with Panerai, the hottest watch brand on the planet next to Rolex. Of the other brands mentioned I like Vacheron the best.
Jim