My choice was the Kawasaki. The Kawasaki has been the engine of choice for some time. As a matter of fact, the Gravely HD only came with the Kawa. Now they're pushing the Kohler, which non surprisingly is what the comparable Ariens come with. However, the Kohler 7000 series was released last fall and their promotional materials imply a lot of new, heavy duty stuff. It's spec data seems to compare favorably to the Kawa. This all leads me to believe that this new Kohler might just be a good one. Have you heard anything about this new engine?