I've owned both the Zu and Moon Audio Silver Dragon. Both were excellent, though my preference ended up being the Zu (at Head-fi people are split between these two cables, generally).
I'm a head-fier too - loving music is a very expensive hobby, isn't it?!? I got the Zu Mobius cable for my HD650s and am well pleased with it. Besides, the silver aluminum connector on the cable at the headphone end is just so cool! ;-)
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