Which One? - Polarising filters

Hello,

I'm looking for a very good polarising filters for my Canon 24-105 lens... it should be a 77mm. I've been looking in B&H but there are so many choices that I would like to know your opinions.

What would you recomend?

Thanks!

The three CPL's most often recommended are: Hoya(multi-coated), B&W MRC and
Heliopan. I'm using B&W and Heliopan and am very happy with them.

B&W Kas is what I have.

I am still playing with my first polarizer, so I can't give a real comparison but I will say I like my Cokin system alot, it makes for very easy changes, and allows me to stack filters if I need to. I ordered a lenscap from cokin that slides in like a stacked filter and protects the polarizer when I am moving about in the brush or in a wet area.
Obviously. there are reasons that the better models cost more, but the features and usability of the relatively low cost Cokins fit my requirements for my first polarizer.
Have fun

Thanks guys!!!