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Of the eyepeices you short listed, I use the Radian 6 and it is an excellent eyepiece giving 20mm of eye relief and a 60 degree AFoV. I've used it on Mars a few nights and like it. My scope is a 10" f1200 dob and feel that this is on the edge of useability as it gives 200 x magnification in both our scopes so some nights images are blurry when the seeing conditions aren't good, so I end up falling back to my Hyperion 8mm.
Ditto the advice to back off the magnification a little and go for something around the 8mm focal length. Apparently the Pentax XF 8.5 and say the Burgess TMB Planetary series ie 9mm and 7mm are very popular and excellent value for money too. Daniel at Frontier Optics can supply you with both Pentax and Burgess eyepieces.
Pete
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