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Picking which focal lengths to get is not too hard. At the low power end it's good to have something that approaches the largest exit pupil you can use in your scope. That will be an eyepiece that is good for cruising the sky and checking out larger objects. I can see M31, M32 and M110 in the same FOV in my 31 Nagler. Although if your site is a bit light polluted you might not use the 31 so much, but it is a magic eyepiece from a dark location. I probably use my 21 Ethos ten times more than my 31 Nagler in my yard, which is a bit light affected.
The high power end is limited by the atmosphere. I have found over time the 6mm is about the shortest focal length I like to use in my 12". You could always get a 12 and Barlow that.
So between low and high power you just fill in the gaps with logical steps. Just be aware that as the focal lengths get shorter, you need to have smaller gaps between focal lengths as the magnification rises rapidly.
The 24 Pan is a nice eyepiece, but seeing as you ask, it won't see much use on galaxies, except for the big show piece ones. Most galaxies are quite small. My most use eyepiece is the 10 Delos for galaxies as it hits a sweet spot for magnification and FOV.
The only thing the 17 Nagler does better than the Delos is a larger FOV. The Delos has the flattest FOV, best transmission, best colour rendition, better eye relief, is lighter. Having said that, I really like the 17 Nagler as it's a great eyepiece, but you are comparing it to the best widefield eyepiece you can buy. So IMO there is not much reason to buy the 17 Nagler when you can spend less money buying the 17.3 Delos and end up with a better eyepiece.
So a setup with a 31 Nagler then 17, 12 and 8 Delos is one option that ticks a lot of boxes. But you can kick this can around all day and keep coming up with different ideas. That's half the fun.
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