I am in the process of getting a small (21ft) AGP installed. The standard package comes with a single speed pump but with all I've read here I'm thinking of going variable speed. The added cost for the Hayward Proflow vs 300 is $700. If I did get this I would not install a time clock Wich saves about $100. I'm wondering if there is enough benefit to spend the extra money on the VS pump. I live in Maine so we really only have 4 to 5 months of warm weather and our electric rates are roughly $.18/Kwh. Thanks in advance!