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Hi Lynton,
You couldnt go wrong with the 8.8mm or something around that size. Ive got a 10" skywatcher dob with 25,18,12.5,9 and 6mm ortho eps and on most nights my 9mm is about as far as you can go due to seeing conditions. My 6mm does get used however only about 50% of the time. With your smallest at 15mm the 8.8 would be a good step to see more detail plus on nights of really good seeing then barlowing the 8.8 to 4.4 is doable.
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