The 317 is OK. It has a Kohler 17 horse but the drawback is that it is splash oiled. They did not last as long as other JD's.
Look for a 318. They have a 18 horse Onan that is pressure oiled.
I didn't see in the add how many hours were on it. Raise the hood and the hour meter is on the side. I can't rememer if it is left or right. I would say 1000 hours is what would be considered high.
The 3xx series is the class of lawn tractors. After that series, JD cheapened up the product to compete with the store brands.
Go here for more info: http://www.weekendfreedommachines.org/
Google is my friend! (so is Round-up)
Always mindfull of obstructions, do your duty never fail. Keep your hands upon the throttle and your eyes upon the rail.
Never be arrogant.
Don't waste ammunition.
Whiskey makes you think you're smarter than you are.
Always, always make sure you know who has the power.
Don't mess with old men, they didn't get old by being stupid.