I'm looking at trading my 1700 with a 72" befco finish mower for an 04 eXmark 72" mower with a 2012 engine, my 1700 has 1730 hours, the eXmark engine has 26 hours. I mow 3+ acres and don't use the tractor for anything else. I kinda know the value of the eXmark, (about 3500) but I'm not sure the...