One comment on the UHC filter. You may not be too happy with it on a 6" scope. They really cut down the light levels and are usually better in larger scopes. If you can try borrowing one at an observing night before parting with the hard earned.
As for the eyepieces try some at the same time as the filter and see how they work in your scope before buying. They really add up if you are not careful.
Cheers
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