Have you looked into the Pentair IntelliFlo 4x160, I have heard a lot of good things about it. It saves you a lot by allowing you to run 4 different speed settings depending on what water features you have running there by reducing the energy needed at any given time. I guess if you are made of money you can look into the Pentair IntelliFlo, I hear its the most efficient pump on the market... and prob the priciest.... I think its around $1500. I am sure someone else can pipe in on this.