I am looking for a new mower. I have demo'd a few different makes and have decided on a Hustler. Now I am struggling with which model. I mow 1 1/2 acres that has about a 10-15% grade with 30 trees planted on it. I do not want to buy another lawn mower, ever. (Unless I decide to upgrade.) I am considering the 19hp Kawasaki/ 52" Mini Z, the 20hp/ 52" Fastrak (Honda), or the 18hp/ 52" Fastrak (Honda). Does the Kaw have more usable power than the 20 Honda? Would I have any power problems with any of these engines? Which mower should I choose? Thank you for any help.