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I also have a 8" dob and after some extensive reading chose a UHC filter (I got the Astronomik UHC). My impression was (wow) how much darker it made the view, and the second the "wow factor" on bright nebula (Orion, eta-carinae, Tarantula, not so much on the crab). The UHC has also helped to spot some fainter nebula and planetaries that while being very feint through the filter were otherwise invisible. With some exceptions lower power and wide fields provide the best view.
I don't think you would want anything narrower otherwise the light attenuation will make the view frustrating.
Cheers.
Darren.
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