Honestly I agree with the comments on the ZTR vs a Tractor for 1 acre or so. If you got a used Kubota BX series diesel with a mower and front end loader you will be able to do so much more - mulch the beds, plow the snow, and mow the grass.
It might cost you $7000-9000 but you have a multi purpose machine for all seasons. If you still want to get a ZTR I like the JD too, but at $4500 range and they throw in a 2 year major issue warranty (hydro parts and motor).
The Kubota is a nice ZTR - first year design though - and that same model new is $5600-5800 here so for a 30 hr machine again $45-4700.
So think about a small BX Kubota - I think you would get much more functional use and in all seasons by spending a few more $.
Carl