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David.. if you have money to burn, a 10mm ethos would be my first choice (closely followed by the ethos 13mm)
The explore scientific 9mm (or 14mm) 100 degree would give you a very similar experience at half the price.
If you wear glasses, you'd be hard pressed to go passed the 12mm Nagler type 4.
All these are in the sweet spot for a 12" f5, giving you a good balance of sky brightness, magnification, resolution and field of view. I would also suggest a UHC filter to go with whatever eyepiece you end up with.
best
~c
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