Well, I've used 5 mm EPs on my 8 inch dob for some of the best views of Jupiter ever, so it can be handy to have, although it is one of my least used eyepieces. (I can justify it by using it in my refractor.)
If cost isn't an issue, then the Pentax XW is the go. Value for money, then maybe the Burgess/TMBs Planetaries (if they make a 5mm).
I have the LVW, and it is very good, better than the Radian, but weightier. (I'm coming round to wanting lighter, smaller eye pieces, but with generous eye relief, which is actually a bit of an ask.)
I guess no one is going to mention the Televue 3-6 mm zoom...
Good luck with the quest. I'll be interested to hear how it turns out.
Regards,
Brian.
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