Pharmaboy
Headphoneus Supremus
I have the Teak. I don't have the Omni, but do have the Vibro. I've demo'd the Omni, Atticus and Eikon.
If you didn't like the TH-X00 because of the treble, I can say the Teak are better and less bright - but not by much. They're more similar than not. This might be a detractor for you.
I have never heard a bad or bright treble note out of a ZMF headphone. This may be a case where you have to apply giant amounts of willpower and save up for the Atticus or Omni. I think you'd enjoy that more, to be honest.
This is EXACTLY what I needed to hear (it gives me perspective). Thanks for your very insightful comments, @ProfFalkin & @Mojo65!