I selected EAN, Navigation, PPB, Stress/Rescue, and Dry suit. Of those, I'd pick EAN, Nav, and Stress/Rescue first.
I didn't bother taking a dry suit course (and if you're a warm water/vacation diver you probably won't ever need it anyway) and just learned from mentors. PPB I think is really helpful but I find I do well enough (I think) with mentors and some video feedback of myself diving. EAN just makes sense if you think you're ever going to do live aboard diving or something deeper than 60 feet/18m.
I didn't bother taking a dry suit course (and if you're a warm water/vacation diver you probably won't ever need it anyway) and just learned from mentors. PPB I think is really helpful but I find I do well enough (I think) with mentors and some video feedback of myself diving. EAN just makes sense if you think you're ever going to do live aboard diving or something deeper than 60 feet/18m.