Take a look at the "Artesian" brand of pumps. They have several models to choose from. The newer pumps may cast a little more up front, but some draw as little as 1.5 amps, which will save on the electric bill.Ultimately, you may want to call a pump company, give them your requirements, and they can recommend a pump size based on your requirements.
Artesian Cascade Line of Pumps 
