Honestly, part of the decision-making process should revolve around how much you use filtration, and how finnicky you are on quality issues. As far as holders, the Lee filter holders are a lot better than the Cokin System... but then again, if you only rarely use filters, the added expense might not be worth it.
I believe you've misunderstood a bit on the quality of filters... Lee filters are WAY better than Cokin filters in quality.... they're made of optical quality resin and not polyester plastic as the Cokin filters are. Lee filters are second to none as far as quality goes. The main negative to Lee filters is since they're made of resin, they're more prone to getting scratched than glass filters.
In reality, one would be hard pressed to see a difference in images between one filter brand and another. That is... except for the polarizer, in which there are considerable differences from brand to brand. Regarding polarizers, you definitely get what you pay for (higher prices almost always equate to higher quality for this filter.
Whatever you're final choice will be regarding holders and filter brands, for the polarizer buy only high-grades... the quality of this filter is all-important to image quality.
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