You have a good list of high value cable suppliers (IMO).
Consider adding Clear Day & Stager Silver Solids to the list.
Both have generous in-house audition provisions and money back returns.
Check out The Cable Co. and also their Used Cable branch. They have a loaner library (10% charge, as I recall, that can be applied to purchase).
I just got used 2M Morrow MA-1 ICs for pre-to-amp. Sounded better than the very nice DIY IC I had been running. No experience with Clear Day ICs but his double shotgun speaker cable was transformational in my all tube system.
Good luck in your search.