I need to order a circular polarizer ASAP. What's best? Hoya? B+W? Tiffen? Obviously, some are more expensive but that doesn't always equal the best value or quality. What do you like? Also, is there a limit to how far I can step up to use a filter? I was thinking to get the biggest size that fits the lenses I have now and step-up rings for the smaller lenses. If there is a limit, I will drop down a tad to avoid vignetting and the like. B&H here I come!!!!