I'm aware of the holes in my question. It's just that I'm new to Hydraulic Disc Brakes and was throwing the question out to the community to see the various responses. As I stated... I just bought a new bike and I'm somewhat concerned about the availability and price for various consumables and I'm trying to devise a purchasing plan in order to get the best price I can once I see what I may need become available. For the record, 90% of my mileage is on flat ground and good roads in great weather. I don't expect them to wear down too quick.
I do appreciate all the responses.