Evan, I have no exit pupil problems with my 35 Pan and 12" f/5 Dob. I do notice it when using the 40mm eyepiece though. If you could try one first, it might be worthwhile. The 35 Pan is an amazing price, almost half what it was a year ago, and it is a fantastic eyepiece.
I agree the 27mm is not enough of a step from the 24mm, so if your budget can stretch to it, the 31 Nag would be the pick of the two.
Cheers,
Jason.
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