Toro TimeCutter Z4200
19-HP Kohler Courage Twin Cam Engine Power through your lawn mowing at up to 7 miles...
The Briggs & Stratton engine seems strong, easily handling whatever horrible things I threw at it (with a caveat, explained below).
Propulsion was also strong, and even going up a steep incline behind my house required only about 5% of the effort required with my previous mower. The overall build quality is excellent, and it's a real looker to boot.