The bigger you go, the more expensive mics tend to be. As I noted, the most used will be a 0-1", followed by a 1-2". For those, I think going with digital Mit mics is a good idea. Mitutoyo is the market leader for digital metrology tools for very good reasons and I personally think they are worth the investment. Beyond 2", though, I think analog mics are acceptable because we don't use them that much in the typical hobby shop.
For analog mics, the Swiss make the most accurate mics in my opinion. I prefer Tesa or Etalon mics (made by the same factory). The best ones will have carbide faces.
Here is a Tesa that looks to be in okay shape and has carbide faces. You can generally tell how much a mic has been used by the condition of the black insulator on the frame and this one looks like the mic has not seen that much use. I think this is a good buy, Evan.