I have been thinking of getting a 48 walk behind for some of my smaller properties (currently using a john deere 425 aws w/ 54" deck) its getting tired. My 66 exmark is too big. Anyway I ran across a 48 scag hydro walk behind with the sulky it is 2 years old has about 500 hrs. on it 17 hp motor (non floating deck model) what is this thing worth??? any opinions on this unit??