Try Audiogon members Dougdeacon or Cello. I've only heard the silver.
I'm using the silver on a JMW 12.6 and it's very nice together. Haven't heard the copper version except at shows. Mehran @ Sorasound recommended the silver based on my system.
Many comments you'll read are about the copper version sounding "better", but it likely system-dependent. FWIW, the silver is supposed to be a bit sweeter tonally, and the copper more neutral. Either way, the ZYXs are great performers, and allow me to enjoy my LPs more than any other I've heard. Cheers,
There's a good discussion of your question on this thread:
I wouldn't say the copper sounds "better". Its transient response is faster and more lively/lifelike than the silver. I've heard this on multiple A/B ZYX comparisons. Whether you'd like one or the other is a matter of taste. (Of course I might have an opinion on whose taste is "better", but that's for another thread!) ;-)
P.S. Say "hi" to Raul for me next week, and for goodness sake make sure whoever meets him at the airport brings a warm coat, hat, muffler, mittens and a pint of brandy. The poor man's going to freeze. He was shivering here (CT) in December, and you remember how warm it was then.