Re: Pump for a 300 foot well?
If the well does not have inherently low flow (requiring slow pumping over a long time to extract usable water volume) you might be better off just putting in an efficient pump (Grundfos SQFlex) and a pressure tank. Using a large pressure tank (or several large pressure tanks in parallel) will give you some storage under pressure, at less cost and space use than a cistern.
I have a very similar (depth & static) well, and that was my plan up until things reconfigured so I might be getting a grid connection after all. The SQFlex control box will accept power in a variety of forms and run the pump, and powering it from the general system avoids the condition where you have a full cistern but the batteries (on the off-grid electric system we assume you'll also want) need charging. It soft-starts, so there is not a big starting load as you get with a typical pump.
Low well recharge rates, small well diameters, and any potential for the well to run dry all lean in favor of the cistern option. If the well may run dry part of the year, a considerably larger cistern might be called for.
Offgrid non-system consisting of Kohler and Northern Lights generators plus years of fiddling with what panels - inverters - batteries to buy when I finally pry my wallet open and get going on that. Likewise a radiant floor which has air in the tubes, waiting for me to sort out the solar and connection to the cooling systems of the Kohler and Nothern Lights (which might as well provide heat while they are burning fuel to make electricity). In progress, very slowly in progress - but not in debt.