Any opinions on a '97 F250 4x4 w/Powerstroke 7.3l?

I'm considering one, but really haven't had much luck researching the big 3 and coming up with a preference. I need the power, longevity and mileage of a diesel for hauling horses, and the 4x4 for slick ramps and lumpy gravel bars.

I might consider any of the big 3 automakers, but am really partial to Ford and/or Dodge. The year is really not an issue, but cost is. I'd like to stay under $17.5k.