I just noticed this was your first post. Welcome aboard..
A few other things for you to consider. What will your sewist want in a machine? Striaght stitichers abound. Chain stitchers less so. Do you want one iwth back tacking or reverse? Is zig zag important to you? Button holes? many of these can be done with attacments. Bu it is something to consider.
If you want the option for treadle, motor and handcrank you will quickly find that Singer has a huge market share. However, early Singers may not have this boss and screw hole under the hand wheel.
https://www.quiltingboard.com/member...38-582790.html
Without it you are pretty much stuck with treadle only.