I've got a JD850 from the 80's. The only thing I would add to it would be a bucket. That is so handy! Get one with a bucket--It will save you lot's of effort!
If your looking for an older second hand tractor with loader consider buying them seperate as loader tractors are put through the paces down on the farm. Anything from bulldozing and sweeping out orchards to demolishion jobs take their toll. Just make sure the loader is correct one for the tractor. Just a thought that might help