As a minimum, I would strive for Deep, Nav, Night and Peak Buoyancy. The fifth one could be anything, really, that turn your crank but I would probably recomment Search and Recovery. With regard to boat and drift dives, you should be able to educate yourself just by reading the book followed by a trip to Cozumel.
On my course I had the first four and the LDS added boat, which I found pretty much useless since I already had conducted boat dives previously(local, Dominican Republic and a week in Cozumel).
On my course I had the first four and the LDS added boat, which I found pretty much useless since I already had conducted boat dives previously(local, Dominican Republic and a week in Cozumel).