All those are good mowers plus Dixie Chopper. I went through this a few years back and ended up buying a Country Clipper. They are the only ZTR available with a single joystick control in place of the dual levers. I was skeptical about this until I tried one. It is great to have a free hand to fend off low hanging limbs and bushes. They also have tilt up decks for easy access to the blades and underside of the deck. You might not have a dealer close by but you really should check them out if you can. I will most likely never go back to a dual handle model again. Here's a link to their site. I have the 52" Jazee Pro.

Here is a link that might be useful: Country Clipper site.

All those mentioned are good brands. I am partial to the Bad Boy line of mowers. They are tougher than anything out there and have the specs to prove it. They also have several patented features (swing away components) for easy access for servicing the mower. Give them a look at the link below.

Here is a link that might be useful: Bad Boy Mowers