Help choosing a polarizing filter

[budagboy2]

I think its time that i invest in a better filter but i dont know which one to get, from the research ive done i know i need a circular one and i know that B+W makes the best ones...the problem that im having is that there are so many different ones to choose from i dont know which to pick, from this list which one do you think would be the best one for shooting cars outside using a 17-85mm lense
Thanks for all the help

http://www.bhphotovideo.com/bnh/cont...ar&A=search&Q=