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Hi Darren, you probably should buy the first expensive eyepiece at the focal length you use the most. XW10mm and shorter focal lengths are widely liked by most observers, while some are bothered by field curvature in the longer focal lengths in some scopes. The Naglers are all generally good though if you like longer eye relief the 17mm and 22mm type 4's are worth looking at.
My personal preference is for wide field (to better see objects in context) and long eye relief (to be able to comfortably see the wide field and avoid eyepiece fogging).
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