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For your 12" f/5 Dob 10mm Pentax XW is the best DSO EP IME. 14mm has bothersome field curvature for my eyes - whether it does for you depends a lot on your eyesight so try for yourself. 27mm Pano is okay, but not great IMO. I see what looks like astigmatism. Others say it's near perfect to the edge. Again try see for your self. 30mm Pentax XW is much much better IME but it is more expensive. 20mm T5 Nagler is great also, so I assume the 26mm would be also. 13mm T6 is nice although I've grown fond of longer eye relief, i.e. Pentax XW, Vixen LVW. 12mm T4 has long ER...
bottom line, at the premium end a lot comes down to personal preferences, so you really need to go out and try EPs for yourself see what suits.
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