Does such a cable exist- sweet, lush, detailed & dynamic?

Old AU24 and new AU24SX speaker cables are completely different. 
Try Nordost Tyr 2 XLR cables. They may match with AZ speaker cables. To me AZ are very warm sounding and using them with Pass gear might sound too wooly. But it’s what you like ultimately. Enjoy!

Of wire I’ve heard, Audio Note silver wire comes closest to what you want.  Snake River is also good.

I'll second the mention of Audio Note, but with a big warning about fakes. They are everywhere. Probably a 10 to 1 ratio of counterfeit versus real at this point. I would only buy from a rock solid authorized distributor at full price, and even then I'd be nervous.

Very happy with my Veritas Cables so far, they also seem to fit your requirements for a very reasonable price. I'm buying more this weekend with the upcoming sale.

A Wire used in a Cable known as D.U.C.C is able to present with a hint of a Tone of Richness and preserve all the micro details as good as and other signal path wire.

Cables readily available using this wire type are found from Acrolink and Luxman.

Note: D.U.C.C Manufacturer Mitsubishi has recently announced a newer version of this wire type is to be made available.

How long before that is seen as  a purchasable material is a unknown.