I've never seen the inside of an automotive O2 sensor, but
according to Wikipedia, they seem to be the same type sensors that I worked with at a hazmat incinerator to measure O2 in the incinerator exhaust. If they really are similar, then they are a little more complicated than "just 1 simple wire." They
are simple (just a ceramic core with Pt coating on both sides), but building one so it works right is not. All that to preface recommending getting one of the three brands you mentioned (or other high-quality brand) and not cheap out.
