I second the Tara Labs recommendation. I too own B&W speakers and Rotel equipment. I've used Tara Labs, Monster Cable, and Acoustic Zen. The Tara's gave me a bigger soundstage, and much better bass response and fullness than anything else I've tried. They also tamed any kind of harshness to be said about the metal B&W tweeter, without rolling off the top end or ruining the the 'air' or openness in the treble region.
