I have 6 acres to mow various grasses and terrain. I am picking from these new diesel mowers: no particular order- John Deere 997, Scag Tiger, Toro D597. Is there another one that would be good to check out? I am after a 60 inch deck, longevity, excellent cut in a variety of conditions damp vs. dry. I mow 2 x / week due to the grass growth most of the year. The lawn will grow 4" in one week and my wife needs it kept immaculate for her business. I have a 1996 JD 770 with a 60 inch belly mower and it takes a long time to mow with plus an old Craftsman rider for tight spots. I do not like my JD dealer so I have to locate a new one to work with. I am getting ready for demos. The cut of the grass is my top priority. The dealer needs to know his business and set the deck up correctly. I want to be done mowing in about an hr instead of 4. What other mower deck/diesel can compete?