Im looking at getting a new 21". This will be for my yard and one customers so I dont need a commercial grade. Help me out. Im looking for one that has the front swivel casters with a Honda engine and self-propelled. Ive found several with the casters but not with all three things I want. The casters are for my wife. She likes to mow our yard for exercise. Does anyone even make this mower with all three options?