If you're out of the City and have dark enough sky to support the low magnification, I'd suggest a 40mm Paragon...the Panoptic is supposed to be excellent also but I've not had the fortune to try one.
If you've got some sky glow then the ES82 30mm is a great eyepiece. I used to see a little coma towards the edges with my old C8, but the same would be true with any eyepiece pushing the wider field of view (including the 2 above).
Alternatively, you could try the Celestron reducer/flattener...it's supposed to clean up the view quite nicely for DSOs, and depending on what eyepieces you already have, you might not need another.
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