Favorite cable brand.

Interconnects and speaker--Audience
Power--Essential Sound Products 

Without question I prefer Swisscables, I have their Reference interconnects, Reference speaker cables and their incredibly good Diamond power cord. 

Audience 

Each component has a different impedance requirement.

Different cables have different configurations and that interaction is what you are hearing

To optimize waveform transmission, and that is your goal I hope, each cable has to be designed for that equipment. Every other electronic discipline employs this, and any EE will reiterate the same thing.

Wonder who would build a cable for your particular impedance and application? It took me 3 years of calculations and building 150 cables (down to even forming the conductors) to perfect it. Not easy, but it ends the upgrades.

I don’t have a lot of experience with entire looms, as opposed to mix-and-match, but I have had Zu Cable and Acoustic BBQ looms. Audiogoner Bill Dion used to make the Acoustic BBQ; while I gather he no longer does, you still can find some of his products in the used market. Although I have used individual Kimber, Audience, and Morrow cables that were more expensive than the Acoustic BBQ, it was only the latter that made me want to acquire a full loom. Unless I make wholesale changes in my system, which I don’t expect, I don’t anticipate buying anything else, as the Acoustic BBQ sound that good to me.