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Although the Powermate is an exceptional piece of glass it makes for one heavy eyepiece when combined with a large Nagler or Ethos. May I suggest a smaller focal length eyepiece in lieu of the Powermate for your higher powers.
The torque from the long and heavy eyepiece/Powermate combination can rotate (unscrew) your 2" visual back. Not sure if a SCT crayford would have similar problems.
The Type 4 Naglers are certainly more comfortable with the longer eye relief but of course they don't have the 100 degree field of the Ethos. You will have to look around to see the entire field with the Ethos which may or may not be to your liking.
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