proedros
Headphoneus Supremus
I'm considering them, but sibilance would be a dealbreaker for me. What genres and formats did you listen to?
the only thing that RE-600 do not have is sibilant highs , in fact coming from the RE-272/EQ5 i find the highs a bit 'tamed' compared to these 2 (i never found the re272 sibilant , but the eq5 was a bit 'hot' in the highs region)
the only thing that worries people is their cable , but compared to the re400 (which i also owned and for which many complaints exist) they have a much better cable.
again , there is no sibilance whatsoever with the re600