I would look at the kubota l series l2500 , l3000, l3800 etc.. like this one....Pardon Our Interruption
I agree. Just how much of this 4 acres needs mowing? Could it be only 1 acre for mowing.What are you mowing - a nice lawn, trails, brush, a field? How much of the 4 acres will you be mowing?
I'm not sold on orange. It's just that from my research I thought parts were more reasonably priced than for green.Then back to my original answer - Any Kubota 30-45hp from 2005 on. It will take patience and a lot of searching to find a good used one with a loader for $15k.
I know you want orange, but a John Deere 3032E would be easier to find.