I would go with Daves selection above but swap the 9mm for a 12mm if getting a barlow also.
The 12 is a good magnification for dso work, and a useful medium-high planetary mag when barlowed. The 15 makes a good lower planetary mag barlowed for nights of average seeing. It would be very rare that you could usefully barlow the 9mm
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Glenn, the 500 series are junk, 2 gs eps and a barlow would be a better option.
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Agreed 100%