If your scope is a refractor, the only one I'd get is a minus violet to tame the colour fringing. If the brightness of the Moon really bothers you, a neutral density filter will help, but with a 6" you will get used to the bright Moon soon and you can see more without the filter. I would not bother with nebula filters with 6" of aperture. Colour filters are also mostly useless ie unused IME.
If the scope is a refractor, (and maybe even if it's not) I'd seriously consider upgrading the mount to at least an EQ5 or better.
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