The CTS is basically a 9500 with two rotors running lengthwise instead of the strawwalkers. I think it has as much or more capacity than the 9600. The advantages the rotor would have in my oppinion is that the rotors is more efficiant at seperating the straw and grain. Also the strawwalkers has been the 9000 series weak spot, because of loss over the walkers and problems with the strawwalker cranks and walker bearings. I don't know what a used would be priced, but I've heard that a CTS is as much or more than a 9600.