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TMB SuperMonoCentric (SMC) (if you can handle the small field of view)
TMB Planetary
Vixen LV or NLV.
Zeiss Abbe orthos will be outside your price.
Two things degrade contrast:
1. Lots of lens-air surfaces (also lots of elements). The best high-contrast eyepieces are those with just 2 air-glass surfaces - TMB SMC's have three elements cemented.
2. "Multicoated" anti-reflection coatings. While very durable and having very low reflection, "multicoated" coatings scatter more transmitted light than do the magnesium-fluoride coatings.
The reason I suggest the Vixen LV / NLV is that these are very comfortable to use as they have a massive 20mm eyerelief, far more than any ortho or plossl. For contrast, color, etc my own LV's compare favourably with the other planetary ep's., so no complaints there.
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