I have about 1/2 acre that I currently mow with my Toro walk behind mower. I want to purchase a riding lawn mower but know nothing really about them such as what amenities and which brand would be the best...I am looking for opinions. Is there alot of quality difference in say a Craftsman to a John Deere, I assume alot of price difference. I would like to purchase a used one but again, what do I need to look for? Thanks