I've read several dozen threads on regulators and I'm still uncertain the best course of action, so I burden you with one more thread on the subject.
Background: My son has waited his entire short life to get into diving. His mother and I were very active divers before he was born, but we took a break from diving until he was old enough. He was certified last month in Maui, and we have been diving local quarries once per week since returning. We plan to resume our pre-parenthood dive schedule of 3 - 4 dive trips per year, and he is 100% over the moon about diving.