Which of the following would be the best amp for HD-650's? 1) K.I.C.A.S. Caliente 2) Gilmore Lite 3) Meier Audio Corda Cantate 4) C.I. Audio VHP 2 Is the dedicated power supply for the VHP 2 worth it?

Is there really a difference in quality of CD-R's? For example, Sony sells CD-R's labeled "music" and another labeled "data". The former is more expensive. What's the difference? Are certain brands considered best for burning music? Sony? Verbatim? Memorex? TDK? Best place to...