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I'm not very familiar with eyepiece choices for refractors, so hesitate to offer advice. I think thought that it's worth starting with your experience of the eyepieces that you've already got. What focal length eps do you have, which ones do you use most, what is missing ie wide field or high magnification. How important is eye relief vs field of view? It might well be worth thinking about 2 good eyepieces and a good barlow so that you have 4 focal lengths. This would mean that you would want to avoid focal lengths that will be duplicated by your barlow.
But, above all, if you can have a look at some eps through your scope at a star party. There is nothing like a first hand experience and eps perform differently depending on the speed of your scope.
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