For the money, a late N series from a good home would get my vote. lots of capacity for not much $$$. I don't think there is much diference between the late N's and early R's. I would not be afraid of the Duetz if it has had good care. Either way be prepared to spend a little $$$ on repairs and upkeep (augers_belt_bearings). Also doing the first stage of hyperizing will make a tremendous difference in capacity and grain quality. Pete Hinrichsen