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The 20mm of clear aperture is a real limitation preventing you getting super wide field views without the eyepieces vignetting.
A 20mm TV plossl will be fine, the 25mm likely also. Any of the Delite eyepieces will work. The 13mm Nagler or 14mm ES eyepieces will give about the same FOV at higher magnification, but with less eye relief.
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