I have made the decsion that I am going to purchase a core Aerator this year, but have not made up my mind on the brand and model, yet. I would be using it for 3/4 to 2 acer residental lots which have hilly terrain. I have been using a 24 Inch 5hp Ryan and have not been impressed. Thinking a 9hp 36 Inch with dual turning capability would be the choice. What would you guys recomend?