I am looking to get a ZT mower for my 2+ acre lawn. I am currently looking at a new Gravely HD52, or a 10 year old used Exmark Lazer Z. The Exmark has 1660 hrs on the meter but supposedly only 100 or so hours on the Kohler Pro 23 motor. It also has a new seat, battery, battery cables and has been completely serviced with new fluids and filters. The Pictures look great. What are your opinions on the two mowers. Price is $2500 vs $4500.