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Didn't think there was such a beast as a high power planetary/DSO eyepiece.
DSO's require aperture not magnification. The higher the mag the dimmer the object through light loss. Also a larger apparant field helps.
Lunar or planetary observations are restricted in the mags by seeing conditions/transparancy. Not often that you get to use more than 200X and get good images (unless you live on Mauna Kea). You also don't need a large apparant field.
Best advice has already been given by others. An eyepiece between 15mm-20mm for DSO's and for planetary use you can get a Powermate instead of a barlow, you will be hardly aware that the Powermate is in the optical train (they work slightly differently to a barlow).
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