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Simon,
The planets are very bright, so knocking out a lot of light is not necessarily a bad thing. An alternative approach would be a variable polarizing filter set, which allows you to tune the light throughput to your own tastes. Have a look at the Meade #905. This model has an external slide that allows you to adjust the light throughput without removing the eyepice.
BTW - I was using a neutral density filter with a four-inch scope to knock down the glare at the last Mars opposition. You will need to do something with that eight-inch Newt, whether that be an aperture mask or a filter, if you hope to enjoy Mars.
Clear Skies,
Bob
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