If you don't need a loader then the 9N/8N is a suitable mowing and bush hog tractor with the overrunning clutch installed. Just find one that doesn't smoke, can smoothly lift implements and has working brakes. You can even get one of those dirt scoops for it pretty cheap... Don't buy new. They are no front loader but beats the heck out of a shovel. With old tractors just make sure it's a 3pt hitch too. I personally like old Massey Ferguson because of the semi-modern features but still relatively easy to work on.