The B+W 67mm MRC Circular Polarizer Filter is the 67mm variation of the more-fully reviewed B+W 77mm Circular Polarizer Filter.
I actually have the Kaeseman version of the B+W 67mm MRC Circular Polarizer Filter. The Kaeseman version uses better foil (though you are unlikely to see an image quality difference) and is edge-sealed (great for wet/humid environments).
I highly recommend circular polarizer filters in general and as always, recommend that you avoid cheap filters as they are a waste of your money. You will ventually decide that the image equality degradation that comes with a cheap fitler is not acceptable and you will have to buy the quality filter anyway.