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If you want to go hunting faint Deep Sky Objects, a 2mm exit pupil is best as far as I am concerned. For you that means a 2X5.9= 11.8mm eyepiece, and the closest a 12mm eyepiece.
And you'd want that 12mm eyepiece to be at least a wide angle, or better yet an ultra-wide angle, which make life a lot easier when pushing a dob around.
A Barlow or Powermate would only really give something useful in the high power range with the 9mm eyepiece. Personally, I'd go for 4, 5 or 6mm wide angle eyepiece (perhaps a TMB). Again, I mention wide angle because the field of view will be small, requiring a lot of pushing the dob around to follow planets.
Regards,
Renato
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