As the title states, if I am looking for a used one. What do I look for? I see there are many different blade configurations. Different brands. Different engine makers. Many differing HP ratings. Other than the obvious "Does the engine run" question, what should I ask a seller? As a home owner, what width should I look for? (My max is 38" due to egress restrictions to the back yard.) Bagger? What else? Also, what is a general price range for YOUR suggested unit on the used market? THANKS!