I probably should not have mentioned my preference for the D5000. I wanted to provide a reference that made it clear that me and Jude do not share the same idea of what constitutes our ideal sonic qualities. Without a doubt, my Mad Dogs are the best reference headphones I own, from a technical perspective. They provide the most natural reproduction of the music than anything else I have ever heard with my equipment. Everyone seems to agree that the Alpha Dogs go even further in this direction of "naturalness". That is good enough to convince me to upgrade.