If the innards are still intact, then get it. If you're planning on getting a Detroit, or something that is going to replace the carrier, and get matching gears to match the X, then really, only the axle shafts need to be in good shape.

If it were me, I'd give $150 for it, if the ball joints were good, the tie rods were good and u-joints for the axle shafts were good. Otherwise, you're going to replace/rebuild the rotors, bearings, hubs and seals anyway.