With my 6” f9 AP, I was happy for many years with University Koenigs. 32mm, 24mm, 16mm, and a 7mm Nagler. Lately I’ve been really enjoying a 41mm Panoptic. It gives a wonderfully wide field (all of M31 and both companions, for example). I’ve been thinking about adding a couple of other Panoptic sizes, and also trying a 4mm Delite that I have for another scope. I never really liked a 4.8mm Nagler with it, but the Delite has better eye relief.
Delites are always a delight! I have the 4mm and 3mm that I use with my TV Genesis SDF. They are nice eyepieces. You would enjoy the 4mm I'm sure. It's very sharp and has good eye-relief.