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The Vixen is probably just as sharp off-axis as the nagler and pentax at F10. If you change to a Newt at f5 or below than it won't be. The nagler has a wider field but the pentax has longer eye-relief.
With modern multi-coatings the difference in light-throughput between these last 2 compared to the lesser element designs is negligible.
Also, the T6mm 9mm nagler is much sharper on-axis than the original - if you can tell the difference between this and a specialised planetary eyepiece then you have better eyes then me. They are cheaper though.
BTW - have you considered the Burgess/TMB Planetary series or radians if it is just for planetary work?
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