You want to do PM checks and record accurate readings or just connect a high test voltage for a relatively simple go/no-go test?
I have a relatively inexpensive analog megohmmeter that works great for the simple go/no-go testing. I don't know that it is a good tool for extensive PM program but I don't have too much need for that.
You don't really even care what the actual reading is with this thing. If all you want is to know is if there is an insulation problem and are sure you have isolated what you are testing from other paths - hit test button - if the needle moves very far at all you have an insulation problem. With a regular DMM, if you get a reading in the meg range you don't really know for sure what you have, high test voltage removes almost all doubt.