I use Nordost, Siltech and MAS. For example: I was using Siltech with my tuner, and was comparing it to another tuner using MAS Grey because I did not have another Siltech available without tearing apart the system. Well I liked the other tuner, so I replaced it in my system and discovered I did not like it as much with the Siltech that was there, so it is being run with the MAS I demo'd it with. I am sure my system would sound fine with one brand, but I am happy tweeking it further with different cables.
As a point of reference for you, I am also running a Blue Circle BC22 with a Motif MC-8 (Conrad Johnson). My speaker cables are Blue Circle's best, the BC92. My power cords are Vansevers except for a Blue Circle BC62 from the wall to the conditioner.