For observing nebula I would recommend good wide field eyepieces. Some classic nebula are very large and it is nice to take in the whole view at once. The same quality wide field eyepieces can be used for globs and double stars. Although serious double star observers often prefer minimum glass eyepieces like Plossls or Orthos.
TeleVue and Explore Scientific both make good widefield eyepieces. For nebula, I would also recommend a UHC filter in your refractor to bring out the contrast better.
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