I have sampled the 00018 and 00028 and much preferred the 28 over the 18. In fact the 18 seemed rather lifeless to me with very little resonance. Granted I only tried one 00018 so they might not all be the same but I have heard that comment before from other members. If I were in the market and thinking about the models you listed I would definitely try the OM21 before making a final decision as it has the wider nut and that appeals to me.
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