You're on the right track and yep Big Box store pumps are usually junk but cheap and they do work. I'd recommend installing a Pside-Kick. The Pside-Kick includes all that you will need to give you constant pressure for your irrigation system while extending the life of your pump. Go to http://www.cyclestopvalves.com/products.html to see the Pside-Kick. If you can't find it in your area contact Cycle Stop Valves they can assist you. NOTE: Don't purchase a VFD type pump!