Davo,
maybe, and yes everyone has differing ideas.
For viewing I felt that the 31 or so is a bit long, and in a round about sort of way wasted. I would probably opt for nothing longer than the 26mm (and in my case the 22mm).
The the shorter lengths: 17 and 9 maybe, although with a 2x you will eventually double up.
I still feel you need a decent set of planetary eyepieces, orthos or good Plossls, although of late as I said I have warmed to the 12mm Nagler, so maybe I am just being old fashioned.
The imaging at prime and with a 5x is great, but in some case, lunar especially, I find the 5x tooooo much. If the seeing is not conducive as well it is too much. Then I use the 2.5x, or eyepiece project. If I had to I could get by imaging without the Powermates, and just E/P projecting with the orthos, and these allow more freedom of image scale as well. As the Americans have coined though. YMMV.
Gary
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