I would go with the scag turf tiger. They have been makin this mower since 1998. Obviously they have improved the decks and engine options have changed. If I was mowing that many hours I would go with the cat diesel or the liquid cooled efi kawasaki. I personally am on my second scag mower. My first was a belt driv walk behind that I had from 1996-2005 and put a little over 1000 hours on it. Currently I have a wildcat with 1100 hours that I bought in 2005, and a vride that I purchased last year. I am looking at replacing my wildcat with a Turf tiger mayb next year.
Bailey Lawn Service of Tulsa
52" scag wildcat
36" scag v-ride
Shindaiwa t-270, eb-630
Scag giant vac w/ 18 hp vanguard