Nice summary. Maybe a little low on price on water pump method.
The AS 606 is $16.49 before shipping from BigAls and a digital timer around $10.00 though I suppose one might find a better deal. Add in some hose and a flow control and your looking closer to $30 plus, IME. I spent ~ $13 each (shipping included) for a great flow control pincher from US Plastics, though I could have bought a much cheaper unit. That said, its all worth every penny since one's time should be considered valuble.
To anyone sitting on the fence, if you start autodosing, ya won't regret it!
Three Tanks...Eheim 2128 & XP3-90G, Eheim 2128-65G, Eheim 2232-25G.... Tek 4x54 watt T5-90G, Aqualight 96watt PC 65G low tech, 65 watt Aqualight-25G.... Hydors-90G & 65G ... Flourite in 90, 65, & 25 Gallons, .... Auto Water Change/Auto dosing on 90 & 65 gallon..... AGA member......