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The 35 pan yields a 7.1mm exit pupil in your F/5 dob which is something to consider. If you're not perfectly dark adapted, you might have problems with shadowing caused by the secondary mirror. The TFOV is 1.6°.
The 31 Naglar produces a 6.3mm exit pupil which won't cause any problems, with a slightly wider 1.7° TFOV, so I would save my pennies and purchase it instead of the 35 panoptic.
At F/5, either eyepiece will be fine without a paracorr, you can look up reviews of each eyepiece, but the amount of coma one finds objectionable varies from person to person so I recommend trying the EPs if possible before committing to a purchase.
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