You might consider the Subgard. It goes on top of the pump and protects the motor from running dry. I would recommend doing this now, not later.
You have more than covered the protection with "Add-ons:
Extra check valve (?)
Cycle Stop Valve
Pump/Motor Protection Device"
The torque arrester is a joke. Surge arrestor, quick trip protector and pump/motor protection device all sound like the same thing to me. The Cycle Stop Valve is a great idea and should be used with a smaller tank. The Pumptec and or the Cycle Sensor are good protection devices.