No, you won't need slim on your 17-55. The PRO1 you linked to is multi-coated. I would recommend you stick to multi-coated filters. They help reduce glare and make them easier to clean in some cases. Most manufacturers offer both linear and circular polarizers. All the ones you linked to have "circular" in the title, so you're fine.
I would recommend not cheaping out on this item. It can be sticker shock looking at these, especially for a 77mm filter size, but when you're putting them on the sort of lenses you own, you want high quality. Also look at the Hoya HD CPL at Maxsaver. They have it for a fantastic price.
I suppose it's "only" ~$20, but what makes this one:
http://maxsaver.net …izing-Digital-Filter.aspx![]()
so much better than
http://maxsaver.net …lar-Polarizer-Filter.aspx![]()
?

