Hi Brent,
Think of the max possible range of eyepieces that suit this scope, and divide that into 4 or 5 roughly equal magnification steps and lets see from that what makes sense.
At the short end 7 or 8 mm. At the long end a budget 25mm eyepiece should give the maximum field of view in the 1.25” barrel.
Using 10 and 20: a set could be 7, 10, 14, 20 or the 25.
Personally I’d say skip the Barlow and buy 7 and 14. Not a lot of difference between 20 or 25, keep what you have.
Or the Barlow and a 14mm or thereabouts.
There are also 1.4X and 2.5X Barlow’s, which open up more possibilities
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