The 9660 walker would be a good machine for you as its as close as you will get to 9600. I worked for a cutter out of OK how had 2 brand new and the were a good machine, we had more issues with the fronts than the machine.
The WTS has a few differences from a standard 9660, most notably the extra drum on top of the walkers to aid walker loss. Alot of parts on the WTS are specific to it. It's a very european machine. Has more horsepower too.