I'm no expert in these things, but one thing I've read before which does make sense and I've tried to follow is to *not* buy in doubles, as if you acquire a 2x barlow that will give you an equivalent of double magnification for each of your eyepieces.
My scope came with a 30mm and a 9mm, I bought a 2x barlow and subsequently a 26mm, so I now have 30mm, 26mm, 15mm, 13mm, 9mm and 4.5mm.
Malc
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