Help choosing a riding mower for a smaller yard.

I have a 0.60 acre yard and the backyard is fenced in. I am not sure what mower would be best for me. Looking to stay under $4000 all in. A ztr might be useful for inside the fence and getting in tighter to corners but they are more expensive it seems and I have never actually used one. My yard is pretty darn flat and no real obstacles other than a small tree that will eventually get removed. There is a walkway in the front and a well in the front yard though.