I need the opinions of some professionals! Just bought a home with approx 2 acres, fairly flat, fair share of trees. Thinking of a ZTR but not sure if I should buy a new residential, new commercial, or used commercial ZTR. What criteria (if any) would warrant getting a residential unit (say Toro Z5000) vs. my other options? Also generally speaking, what is the life expectancy of one vs. the other. Thanks!