I've got a very old PB4-60Q Polaris booster pump. It needs replacing, so I was wondering what would be the better replacement. Should I stick with a Polaris PB4-60 or maybe go to a Pentair or Hayworth? Originally I had a polaris 280 and replaced that with the Pentair Kreepy Krauler Racer. Also, during the last 10 years I've converted to a salt water system. Pool is 20x40 Grecian L (32000 gallons) inground.