i would never tell anyone to by an 8n or 9n ford as a utility tractor. they sold piles of them for 2 reasons. they were cheap and they had a 3 pt. beyond theat, they are too light, have too small of tires, have no power steering, no live pto and crappy hydraulics if any.
if you need to do any serious work you need live or independant pto, good hydraulics, power steering and a good 3 pt. hitch.
if you want to do back hoe work, there is nothing that will fit on an old ford that is worth having. for that matter i doubt that anything you find in your price range would be sufficient to run a back hoe. a back hoe needs lots of flow and capacity something few older, smaller tractors have.