I am getting ready for my first ND and Polarizing filter purchase. I have been reading a lot of the postings here so I think I am just down to a few minor questions.

I am looking at starting with the B+W 77mm 3-stop and 6-stop ND filters as well as the 77mm Kaesemann XS-Pro Circular Polarizer filter.

First Question - The XS-Pro gives a warning about the outside diameter size and some lens hoods may not fit. Do I need to be concerned with my EF-S 17-55mm f/2.8? Also down the road if I go full frame, I would most likely end up with the EF 24-105 f/4L and EF 17-40 f/4L.

Second Question - recommendations for filter cases to hold said filters? Something to hold 3 to 4 filters. Generally, I would be putting the filter holder into my camera backpack when I am out using them. Anything better than the plastic cases they come in?

Thanks!
Eric