About: http://webisa.webdatacommons.org/376683791

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	can not say anything about any of the headphones you listed except for the M50 and HD600, but in my experience I would say that the D2000 is definitely a step above both of those two for electronica.
http://www.w3.org/ns/prov#wasQuotedFrom	head-fi.org