Are you pretty intent on buying either Virtuoso or Crescendo IC's? The reason I ask, within the past few months I sold some Crescendo's, I found an IC that is better. I sold the Crescendo's and bought some cables from a company in New Jersey called Virtual Image. The V.I. interconnects have better bass, speed, and cast a wider sound stage than the Crescendo's. You can buy the V.I. new for less money than you can buy the Crescendo's used.
