I am a Homeowner with about an acre, but most of my backyard is a hill. I have tried a Ride-On with no success. I bought a John Deere Commercial 5 speed 21" Mower and it works great, but it outright takes too long. I have been told a Commercial Walk-Behind is the only tool for me. I have narrowed my search to a John Deere GS30, Scag and Exmark Metro. All will be Belt with 36" Deck. I looked at the Gravely 150, but did not like it or the local Dealer. What do you Pro's think? I will use mine for about 30-40 hours a year. Most of you do this in a few days; so I realize even the worst I can buy is overkill for the job. However, $2200-2700 is a big ticket item and I want to be a diligent consumer. Thanks!