Get a standard regulator with a paintball adapter. That way, when you upsize your cylinder, you won't have to immediately upgrade your regulator (well, not yet, anyway).
However, you said you want to get it right the first time. Unfortunately, the Aquatek regulators are not really compatible with that goal. Do some thread research here before you decide whether to buy. There's a very good reason the Aquateks are as cheap as they are.