I have a 14,000 gallon 19x32 Rectangle shape, Depth 3Ft-5Ft. Pool with a Sta-Rite MAX-GLAS II 1.5 HP. I only run it 3.5 hours because my California PG&E hourly price per kWh can range from $0.19 – $0.33 depending on my usage which is on a tiered system, meaning that the more electricity I use, I move up to the next tier, therefore pay more per KW. My question is should I pay more for a Pentair VS pump at $900 or get a 3/4 2 speed pump. I want to run my pump 6-7 hours and not and still save $$.