It would be helpful to know the pumping water level at say around 10 GPM...that's the most important piece of info for sizing the pump. Also, I've found it to be a lot cheaper to put together your own solar than to buy a solar pumping system. I've used the 3" Grundfos SQ pumps (not using the constant pressure controller). Given the fact that you have a good producing well, and also the very cold temps you have, I would avoid a holding tank. Look at pump curve for 5 sq05-270.... You can get this is 115 volt, that is very, very energy efficient...can be run with 1000 watt inverter and batteries, charged with a small panel array. Set this at 200' and put a 40/60 switch and 119 gallon pressure tank.