Thinking about finding a used one, but not sure about all the different eras of the DMM. What's "the" one to look for? What's a close second or third, since "the" one will likely be too expensive or difficult to find. From what I gather, big box is key....and the new XO ones aren't so stellar. Not interested in Tap Tempo or the Memory Boy. Just a classic, definitive example of an EH DMM.