I'm considering getting the Cokin Z-Pro filter holder and Hitech ND filters (http://www.2filter.com/prices/Hitech_Z_package.html). Seems like a good choice that will allow a lot of flexibility to use with varying sized lenses.
My question: if I want to use a circular polarizer in the Z-Pro holder, what should I get? The only viable choice I can see is a 100mm screw-in polarizer that would fir into the holder, but not too many choices out there with that size. Am I missing something obvious?