We are going to purchase an Exmark very soon, within the next week. We mow approximately 4 acres of lawn and walnut tree orchard. The terrain is somewhat rough, but not hilly. Someday we could be mowing more land. We are leaning towards the HP 20 horse Kohler 50" deck. But, the price is scary! How do we go about negotiating the price with the dealer? Should we consider the CT or the AS? Thanks!