What eyepieces do you currently have? It may be cheaper to just get a coma corrector like Paracorr or ES HDCC to clean up the views in fast Newtonian then redo your entire eyepiece collection.
On a side note answering your question.
PROS of Naglers, Delos and Ethos:
Sharper views, better corrected field, less light scatter improving perceived contrast, more eye relief - thus more comfortable viewing and larger apparent fields of view from starter eyepieces.
CONS:
They can be quite heavy and cause balancing issues.
Your wallet and significant other will hate you. Not might hate you. They WILL hate you.
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