Need advice on rich sounding cables

That's what I would do too,try the PC.

Spending $4K on speaker cables to make an $18K pair of speakers sound better seems a bit lopsided. Why not trade up to a better speaker or a tube amp or preamp before spending that kind of money on 16 feet of wire?

I picked up the Snake River signature that was being sold on Audiogon second hand, was advertised here at $1250 for a 3 meter biwire pair.

Great price.

will let you all know how it goes!

If you are going to demo cables, I would add Fusion Audio cables to your list, which are known for their midrange "liquidity". I found their Enchanter power cord to add some warmth to my Pass Labs amp, while preserving frequency extension. Cheaper SC options that play above their price point by a good margin are Clear Day Double Shotguns ($500), which I use, and Triode Wire Labs ($700). All offer generous, no hassle return privileges. The Cable Co is great, but their 5% charge per cable is money down the drain if you don't end up buying from them.