My hp is very similar to the 2520. In fact the 2520 was one of 3 I picked from. Very nice tractor, but expensive. I don't have any issues at all with a 5 foot finishing mower and I sometimes have to cut wet. I cut 7 acres.
Definitely buy the 2520 at minimum. One year later on four acres with my R, I really want a bigger tractor. I have a lot more trees than you, and a lot less finish mowing (.5ac). Any time I try to move earth the little R shows it "sub" class.