What is the best booster pump for an in-ground spa?

I need to replace my booster pump for my in-ground spa. The current pump has 2in connections and is a Sta-Rite Dura-Glass 1.5HP pump. I am looking for something energy efficient but I don’t need a variable speed pump.

We’d recommend the Pentair Whisperflo WFE-26. This is an energy efficient 1.5HP pump with 2" ports.