I have a Pfaff 60 treadle and love it. My cabinet and machine was $80, first treadle I've ever bought that only needed the lint cleaned out and oiled. It sews smoothly and quietly.
Also have a Pfaff 1222E and its trouble free, had it 5 years and only needed servicing once to remove the mass of thread behind the bobbin area; the former owner did that mess.