I have two brands for interconnects and one for speaker cables.
Mogami and DH Labs for the former, Mogami for the latter.
I've gone down the boutique cable route and I've found that without exception they were all subtractive. That is, one way or another they took something away from the original signal.
For instance, I've found Wireworld Eclipse a little dark. Having IC's and speaker cables in Eclipse meant the whole system seemed darker, but also seemed to image better, at the cost of some overall musical energy.
I just don't have the energy and time anymore to try to split hairs among boutique brands and now just have settled on products that to me seem to let it all through.