I have been cutting grass (and weeds) for about 5 years now. I have decided to move to a commercial ZTR mower. I would like to spend around $6,000 (give or take a little $). I have two areas of concern, dependability and quality of cut in short and tall grass. Some brands that I have close access to are Grass Hopper, Scag, Hustler, Gravely, Bob-Cat, Toro, and Husqvarna. I'm looking for around 18-19hp with 48-52" cut. Your professional advice will be greatly appreciated.