I'd go with a KM or MZ. Although, out of the two, I'd chose a MZ. Recently, KMs are more interested in quantity of what they produce rather than the quality of what they produce and the result is sloppy soldering, dents, etc. You won't find that with a MZ.
Either way, you'll be happy with the quality of smoke in a KM or MZ. Good luck and let us know which one you choose!!