I am in the process of looking to buy a new mower. In the past I had purchased a used Scag belt drive and had no problems. I am a smaller operation, one man 42 accounts. I want a hydro walk behind. I see a few used hydros in the paper for sale. If I were to go that route(probably not for my primary mower, I want a new one)for a back up, what are some things to look for.I have no exp. with hydros.What should I look for? Is it better to stay away from used hydros? Thanks for the help.