I picked up an old, but unused, 60" Allied/Buhler for $800 and it's worked fine with my B2150. It does not have skid shoes on it, but that has not caused any problems so far.
It will throw the snow easily 20' away. BUT, it does depend on the "type" of snow. Wet and heavy is tougher, AND it will clog up the shoot quickly.
I use an old broom handle to clear it.
I had to call Buhler to get a copy of the manual for it, and they were really great to deal with on the phone and mailed me a photocopy of the manual.
I actually talked to one of the Buhler family. He also sent me some extra shear bolts free of charge.