In the past I have always rented an aerator, usually the blue bird. This season I am looking to purchase at least one. My Exmark dealer has the new Billy Goat that looks like it is real easy to use. I also saw a ride on in this months L&L magazine. What does everyone else use? I aerate a little over 1 million sg. ft. of residential lawns. Most are 12-20K and a few are around 50-60K. Any thoughts?