.... We have 30-40 dives; but I still want a dive center that will take good care of him.
Were you thinking of hiring a private DM or putting him in continuing education SCUBA classes?
You may be laboring under a mis-perception of what dive professionals will do for you once you are away from your certifying Local Dive Shop in San Diego. When you hit "the tropics", the role of a DM usually runs the full gamut between watching you fall in the water to being an underwater naturalist guide, carrying your gear, helping your buoyancy, or having a crack at your girlfriend. It's all over the place.
Do not count on anyone to attend to further dive training unless that's what you have specifically engaged them to do. Of course, most DMs will assist the new diver and try to keep you alive, but unless you've hired your own DM, don't count on
that specifically focused attention or anything else.
This is the case wherever you go in this world. Once you have changed or severed your instructional relationship with a dive professional, have no expectations.
Many dive ops put actual Instructors in the water to act as DMs because of staffing needs (a small shop, with a few employees performing duplicate roles). Again, do not assume that they are wearing any particular hat, nor should you assume what role a "Dive Boat DM" will perform.