I am starting to look for a new ZRT for Spring and I am finding this to be a bit confusing. They make all the mowers look so similiar that I am having a hard time knowing what is commercial and what is not. I mow just over 100 lawns and I was wondering if some of the experts could give me some input. This is what I found at the dealership today. Z449 74412 48" 18HP Kohler $6,000 Z400 74410 52" 19HP Kaw $6,500 Z449 74415 52" 19HP Kaw $7,700 Z500 74249 60" 25HP Kaw $7,700 If anyone could offer any input on which might be homeowner or commercial? Which might be the best buy? Any personal experience with any of the above models? Thank you so much in advance for your input. Any recommendations for a Toro Z would be greatly appreciated.