Chuck,
The Nightingales tell you what is in the recording, without dressing it up. Absolutely fantastic speakers. I, too, was sorry to see them leave the Odyssey lineup.
As for your question, I would suggest that you try the Enigma Acoustique Oremus (if you can find one; they have a cult following) or the Revelation Audio Antares. Better yet, contact Alain.
I haven't heard the new Odyssey Epiphony, but the original Epiphony (Revelation Audio Vega) is not what you are looking for; it has a different presentation (more "in your face" in the midrange and considerably less refined than the Nightingale in the highs).
The venerable Lorelei is very different from the Nightingale in just about every respect.
Jose
P.S.: I disagree with the statement that the Nightingales are "a little lean sounding". They don't have the heft of the Loreleis, but lean sounding they are not.