I started with an old 1935 straight stitch singer worked extremly well.
Now in my stable is a Pfaff 463 (great machine with computer controled motor) Pfaff 1245 walking foot, Juki LU 563 walking foot, Adler 105(sews through plywood) Adler GK-373 walking foot. The adler 373 and the pfaff 1245 take turns in my movable workshop and gets it's power from solar panels.
Good luck hunting