When you said money is no concern were you referring to the initial cost of the unit or the cost to run the unit over time. If you meant the initial cost is not important I would say go with the heat pump unless you want to open very early in the spring and stay open past the beginning of October. I have one in PA and it works great. Only downside is I usually have to time my initial heating with a warm spell in the spring as it takes quite a few days to get the water temp up into the mid to high seventies. Heat pump output drops off quite a bit with temps below 65 degrees. Your use of a solar cover and full sun will help a lot.