Great, you won't regret it.
BTW, there was an early post from AC (I believe) asking if you were going to use a "drain down" system with vacuum breakers. You were not doing that, which is good, and drain down systems have fallen out of favour because of solenoid failures that allowed water to stay in the pipes and freeze.
"Drainback" systems should NEVER have an auto air vent or vacuum breaker at the top of the system, unless all components are non ferrous. Even then it is not necessary and should be avoided. The water will trickle back to the tank over time, long before any freezing can take place.
Sometimes I am not sure if people know the difference between "drain down" and "drain back".
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