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You don't need EP advice, you need financial advice! OMG look at the collection you already have! Each EP is worth nearly as much as your scope!!
Seriously though, sell the 17mm Ethos and get the 8mm Ethos. 9mm would be better but Ethos come in 8 or 10mm only, and you'll likely find any other 100-deg-FOV EPs lacking in comparison with Ethos (with few notable exceptions that cost more still and do not have anything to offer at these FLs afaik). I don't recommend the 9mm Nagler T6. The Ethos is a much better EP imo.
Anyway, it's better to have more closely spaced magnifications at high powers than at low powers. So 13, 8 and 6 are a good mix.
If you're willing to do more selling and buying, keep 21mm Ethos, sell the 17 and 13mm and get a 10mm Ethos and a 7mm DeLite. Along with your 6mm Delos, that would be probably the ideal TeleVue package for your scope (I assume we're talking about a 10" f4.7-5.0 Dob).
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