The recently discontinued ScuabPro G250V second stage is a very good performing regulator and is the simplist to work on also. It has a metal barrel with a nylon flow threw piston. The knife edge of the oriface is still metal. The fine tune adjustment knob/shaft is also still metal. Metal makes for a great cold water reg. A large diaphram makes the effort of breathing that much easier. But it is the easiet/ best to work on. My choice in the ScubaPro package line would be the MK17 first stage paired with the G250V second stage. The MK17 will keep all water out of the 1st stage forever. Your service on the MK17 would to servuce when the IP increases above 145psi. Keeping it simple, metal makes a great regulator that when put back together works everytime. I don’t own a ScubaPro reg. but if I had to buy now that is what I would get.