I have a John Deer riding mower with foor control hydro tranny (Automatic) that has 2 pedals you run with your foot to go forward or backwards and is very easy to run.. Has a 48 inch deck with blades that have been sharpen , 20 hp motor that has been serviced that is very low hours of only 379 hours, good tires, good seat, in good condition, runs and mows great. How much shouls I sell it for?