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A question back at you - what camera are you imaging with and do you need a filter that cuts light pollution whilst preserving colour fidelity?
If you use a camera with a bayer matrix (e.g. a DSLR versus a mono CCD) maybe consider the Hutech filters. They let more light through but seem to preserve colour balances very well. Other filters can trap more light pollution - but they can really wreck your colour balances (by shifting light or letting uneven amounts of red, green and blue through) - which makes it rather hard, if not impossible to process your image back to true colour fidelity.
I find a Hutech allows me to go for 2 to 3 times as long before things wash out.
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