I would recommend a 13mm T6 Nagler, but assuming the focal length of your scope is over 1200mm, perhaps the 17mm Nagler would be better.
The 13mm and 17mm have probably the reputation as the best televue eyepieces ever.
The reason I mention the focal length is that the 13mm gives near 1 degree FOv at 100mm FL, and the 17mm gives a similar FOV at 1370mm
(your scope a 12" F4.5?)
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