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I'd recommend 12 and 8.5mm Pentax XFs and a good 1.8x or 2x barlow.
I use the 8.5mm XF in the same type of scope, 8" f/4, and it performs brilliantly. THE deep sky EP for that scope. Pentax XFs have only recently become available in Oz through Frontier Optics.
I would not bother with a 3.5mm EP. A good barlow will do a fine job. I use the Televue 1.8x with the XF and that combo works great. When I want more power still, I just add barrel extension between EP and barlow.
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