I just got done buying a ztm myself. Challenging time to buy, between the time of year and the pandemic, dealers are out of stock in many cases.
You can get an eXmark Radius E series for $4999, possibly less with incentives. I was looking at the 50+ inch decks, and in my case, replacing my very expensive lawn service basically meant I felt like I was printing money by buying my own mower because of how quickly it will pay for itself.
I generally like to buy one level above my needs, was looking at Radius X and Kubota Z400 series. I was also in a hurry, inventory was lean. I couldn't find any eXmark Radius mowers to ride! After trying an eXmark lazer Z (too expensive), and Kubota Z400 and Z700 series, I went with the Z700. It's cheaper than an an eXmark laser Z, has superior hydraulics, and a 7 gauge steel deck, i.e., a tank. Since I also have a Kubota tractor I already have a dealer relationship/dependency so there's that too.
For the incremental dough, I just felt the Z700 was more responsive. Having used it for only one mow, all I can say is that I can be heard yelling various equivalents of "cowabunga!" as I charge across the flat pieces of the yard at 11 MPH. Seriously speedy stuff, fun as ****. I bought the 54 inch deck. The z700 is probably 2 steps above my needs, for which had a penny pincher's bit of buyer's remorse, but when I mess with that deck and things that hit it in my yard, that extra steel seems like money well spent.
Good luck.