I am thinking about buying that lens in a few months. I always use b+w filters on everything. For the 70-200, I would think a regular F-Pro mount B+W wouldnt cause vignetting. I have never used that lens though. The F-pro mount is 5mm thick I believe.
For protection buy one of their clear multicoated. You can get it in UV haze or no UV haze. I usually buy the cheaper one but lean towards the no UV haze version.
No Haze-http://www.bhphotovideo.com/c/product/475495-REG/B_W_661001705_77mm_007_Protection_Clear.html ~$79
At 10 dollar difference I would buy the no haze.
For the polarizer, I bought a top notch one with my first lens and use step rings for all my other lenses. If you need more than one great polarizer, buying the 82mm and stepping down is the way to go especially if you plan on using canon's 16-35mm 2.8L II or the upcoming 24-70 2.8l IS II.
(B+W 82mm Kaesemann XS-Pro Circular Polarizer MRC Nano Filter) ~$250http://www.bhphotovideo.com/c/product/752977-REG/B_W_1066401_82mm_XS_Pro_Digital_MC.html
(B+W 77mm Kaesemann Circular Polarizer MRC Filter) ~$144http://www.bhphotovideo.com/c/product/10889-REG/B_W_66_045620_77mm_Kaeseman_Circular_Polarizing.html