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Tough one.
The Takahashi LE 3.6 seems to be universally admired, though with only a 50 degree view you'd better be quick or have good tracking. Televue Nagler 3.5, Type 6 gives you the 82* view and is reportedly very good. The Burgess/TMB 4mm and the WO 4mm also get good press. I believe the latter has more eye relief.
I haven't personally tried any of the above, but what I have tried is a 7mm Pentax XW (70* AFOV) with a 2x Barlow. Seeing was pretty bad, but the image was very pleasing, being sharp, colour-free and with minimal scatter. It also maintained its 20mm eye relief (more or less). If my mount wasn't so rubbish, that's the combo I'd go for.
Hope this helps a little.
Peter
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