Hi all, My pump is dying and seriously oversized, so I am researching a replacement. The filter is Pentiar and current pump is Emerson 3hp. Our pool is an 18 x 36 Grecian with vinyl liner, about 24,000 gallons. No water features, Minimax propane heater. Of course, the pool store is pushing for a variable speed, but I'm thinking I would be dead before it paid for itself. So, a 2-speed is also an option. Here in Virginia, our electric rate is 11.4 cents/kWh. What specific pump would you guys suggest?? Thanks in advance for your words of wisdom!