i want to build a quality headphone based system but not being a total expert on these matters i'll need help from what hifi! I've already bought a pro-ject headbox mk11 headphone amp, i also own a pair of igrado headphones(which i love, but plan to upgrade to the grado sr60, is it worth the upgrade?) then i plan to buy the marantz cd6002. how would this sytaem work together? can i do better for the money? and would the marantz be suited to the pro-ject headbox or does it deserve a more expensive headphone amp like the creek? any advice would be much appreciated.