I am shopping for a new cd player and I have decided on NAD. I cannot decide, however, between the C521 or the more expensive C542 with HDCD capability. I am wondering if HDCD is worth the $200 difference between the two. I have never heard an HDCD disc on a player that decodes it and hope someone can tell me about the difference in sound quality. I have quite a few discs that are HDCD. Should I maybe consider SACD? I have heard that this format is best suited for multi-channel applications however. Will SACD make HDCD technology obsolete?