For hunting down the thousands of faint galaxies at a dark site with your dob, you want an eyepiece which is ultrawide angle and with a 2mm exit pupil. In your telescope, that equates to an 8.8mm eyepiece. Meade sell an 8.8mm UWA, though I'd imagine another manufacturer's 9mm UWA eyepiece would be close enough.
Regards,
Renato
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