I appreciate all the responses. To answer some questions - the filter picks up a lot of red clay, so its definitely needed. The water softener won't pass more than 7 or 8 gpm. Don't know about the UV setup - it might be higher.
A 75 gallon water heater, with a 38 degree city water feed, will **just** fill the tub in the deep winter. (With in-house storage, and thus warmer water, I expect the well system to do better). 1" copper for cold and hot for most of the run, and 3/4" the rest of the way, and Kohlers curved "C" spout, will fill a 80 gallon Pearl tub in about 3 minutes. So, the flow is more like 27 GPM (the faucet says it can deliver 50 at 60PSI, thus my confusion). 3Min is just fine to fill a tub. [The current house takes 10 min to fill a 4 1/2 foot tub - 1/2" copper everywhere, old valves, etc.]
As I said before, this is first well for me. I never heard of polyethelene storage tanks - can someone suggest a site to get more info? I assume then that I use some type of water pump, or air pressure pump, to get delivery...
Thanks again for all the info (which I am trying to sort through :->)