I agree any of the three mentioned mowers would be a good mower. Out of the three the Hustler would be my choice. The Dealer I use sells the Hustler, Scag and Toro and I preferred the Toro Z-Master series. As far as engine Kawasaki would also get my vote but you can keep the suspension seats and the flex forks because there just added expense and don't really amount to all that much. The rear discharge has its advantages in certain cases like residential use if you have a lot of flower beds, pool enclosures etc or perhaps cemetery work. For the most part side discharge will be sufficient for the homeowner.