Hi Gordon, the 17mm Nagler and 10mm XW would be very nice in your scope.
When I had a 10" dob I only used a 30mm eyepiece as a finder, never for observing, since object size and contrast always looked better at 70x to 80x magnification(observing from somewhat light polluted backyard). Thus I'd recommend you don't spend much on your longest focal length eyepiece and use the money for other purchases - argo navis or sky commander, observing chair, etc.
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