I have Klotz, Belden, Mogami, Canary, etc in my studio...but I needed a bunch of mic cables, and quickly for an impending session a number of years back.
All Guitar Center had was Monster Cable. Now I'm ashamed of the contents of the bag where I keep them. I'll never quite feel the same plugging one of those plastic molded and overpriced XLR's into my U87 again...
BTW, I once bought one of their power conditioners. It did nothing for my sound. I was using Apogee converters, a Bryston 4BST and KRK/NS10m monitoring etc - all the good stuff plugged into it. Didn't do jack. It failed quite impressively though when I (accidentally) plugged my Miele vacuum cleaner into a power strip connected to it...nice burning plastic sort of aroma...
...took it back to GC and bought some actual gear with the exchange money...some mics I think...