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If eye relief is your priority, few if any cheaper eyepieces are worth considering. Not all high-end eyepieces are champions in this regard, either - some Naglers are poor and the Ethos range aren't great either.
Your best choices would be eyepieces that are designed to excell in the eye relief department: Televue Radians and Vixen LVW's - fairly expensive, but both ranges will provide excellent and comfortable medium wide-angle viewing with your new scope's premium optics.
As to focal lengths, anything less than 8mm would be pushing the limits of seeing conditions given your SCT's long focal length. Personally, the range from 13 - 24 mm satisfies most of my observation needs and I'd suggest a 19/20mm would be a good place for you to start.
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