I use power cables by Virtual Image, Straightwire Crescendo IC's, and the Kimber Select 3035's. All of these cables came very highly recommended by Dale Fontenot, founder of Roman Audio.
components are:
Cal Audio CL-15 CDP
Cary Audio SLP-50 (pre amp)
Virtual Image Stereobloc 2040 (amp)
The amp is an EL-34 based, push-pull, 18 X 2, tube amp. One thing that I have found is that with a really good amp, you don't need a whole lot of power to drive the Centurions. IMO, the next step you should take is the power cables and I do HIGHLY recommend that you try the virtual Image Piledriver PC's. These are truly awesome power cables.