Okay, you are now in my teen son's territory!!!!
We have been shopping for one.
This is his all-time obsession!!!!
Another vote for the John Deere Z-445.
You might not like our recommendations if price is an issue.
But, we firmly believe that you get what you pay for.
I can't say we would even consider a Troy Bilt.
My son has looked at Dixon, the special edition model with the Yamaha engine and the welded deck. Very low-profile... Relatively quiet... handled really well.
We have a Cub Cadet riding mower which has been great... But are not as impressed with their zero turn.
Right now he and my DH have about decided on the John Deere Z-445. (Thanks Uncle Remus!) A 48" deck. From what I understand, to get the good John Deere, you don't want the model that you can buy at Lowe's. They are not as good. They drove this one. And our neighbors have similar, maybe larger, models. They are very quiet and seem to be really great.