Just learned that my utility is offering a $400 rebate on a replacement pump. My current pump has some age but runs well, but it's undoubtedly an energy hog. I can get a replacement pump for about $900 (less the $400 rebate) and I'm guessing it will pay for itself over this season and next, so it seems like the obvious choice. Am I looking at this the right way? If so, which pump? (As for the install, I can drag my handy electrical engineer brother-in-law over one weekend morning to help me).