I think there is also one other thing to think about...what you are willing to spend up front for a good mower to do the job. For the brands mentioned to do the job you stated they will all start around $5000 and go up from there. One other to put on the list is Husqvarna. I just purchased their high end residential, low end commercial model. 61' I believe and gave $5200+tax. I was given a option on warrenty. Commercial: Unlimited hours- 1 year....Residential: 3 year-750 hrs. I did a quick calculation---no way Ill put 750 hrs in a year duh! So I took the Residential.