If I was only going to have ONE eye piece I’d be aiming for a magnification around 120x. With your 10” it gives a high enough Mag to do some planetary viewing but still wide enough for scanning star clusters.
The closest would be a 9mm Nagler or maybe a 10mm Ethos if looking at TV as a brand. I’d go for the Nagler myself, half the price and the 100° FOV is possibly a bit large for my eyes.
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