I have a Scag Tiger Cub (48", 19 Kaw) with 656 hours on it and it is 3 years old. I'm looking to get a Exmark 60" 25 HP Kohler. My local dealer is offering me $4000 on trade. I'm on the fence. I know that my Scag is getting to the point (hour-wise) that things can start going wrong quickly. And I know that if I'm going to trade, I'm at a point where my Scag is going to lose value soon if I don't. Do you guys think that his offer is a good one?