You will never regret buying any Art Audio amp or preamp. Call Joe Fratus the owner and he'll tell you which one for your speakers.Best customer service of anyone selling high end audio.
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I use a Yamamoto A-08s (+EML 45s) with my Zu Definitions and have no complaints. I have not heard the others on your list, but you seem to have selected a good group. FWIW, the A-08s sells almost as soon as it is posted on Audiogon (which is not common) attesting to either its popularity or its cult status.