I'm a first time tractor shopper. I have 5 acres that I want to clear and put in some trees and fencing. I have about 3 acres of heavy thorny 5'-10' brush to clear growing in clay soil. Much of the brush is 1"=2" in dianeter. I've been looking at the B7500 and JD790. The JD790 seems like overkill and looks bigger than I really want. Would a B7500 have enough power to help clear some heavy brush and pull a box scraper through clay soil to smooth things out? I'm concerned about not enough power, I know what 20HP can do on the back of a boat but have no idea in a tractor? I'm looking for input to my buying decision?