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Eyepieces. Resist the urge to splurge - you really only need 3 for most purposes plus a 4th high-power one when the seeing permits.
I don't use barlows - less glass in the light path is better, ie a good eyepiece.
The shortest fl depends on the focal ratio of your scope but at a guess one around 6-8mm will suit and possibly another around 3.5-4mm.
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