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Explore Scientific, (Especially the 90 degree LER series)
APM aka) Lunt. Hyper wides & soon to be released LER.
Baader Morpheus
TV Nagler, Etho$ & Delos.
Takahashi LE & Orthos (narrow field of view)
Pentax XW (especially the 10mm)
Docter UWA (if you have money to burn)
Nikon NAV HW (as above)
ZAO (Ziess ortho's) (When you get bored of spending money like a normal person)
One thing to consider with respect to minimal glass eyepieces such as Plossls, Ortho's, etc) is that irrespective of how much money they cost or what brand label is printed on the barrel, they will not work well at F5.
Another thing to consider is that the dominant aberration that will limit off axis sharpness is coma. Every eyepiece will perform significantly better with the addition of a coma corrector. Best on the market is the Paracorr 2. Explore Scientific a close second.
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