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I don't know about WO SWANs in the 8" f/6 Dob. I would not risk it without being able to try first. I think they are better in slower scopes.
A 13mm Hyperion or Stratus would make a nice deep sky eyepiece for the 8" Dob. The 13mm focal length is about right for revealing maximum detail on DSOs. These would be the least expensive widefields I'd consider for that scope. They go for around $200. They are just about an ideal magnification for planets too when barlowed. If that is too expensive then just stick to the Plossls for now. Nice upgrades in plossls would be the Antares Elites; you can get from Scopestuff.
Re barlowing, your 15mm in a 2x barlow would give a good medium planetary magnification. Barlowed 9mm will almost always be too much power, but for powers between barlowed 15 and 9mm you can add an extension tube between EP and barlow.
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