What filters are you guys using?

So I was thinking of getting step up rings 49 to 52 and then 52 to 67 mm. I have the Zeiss 24 mm, CV 35 mm f1.2 and SEL18200 for the nex7. I was thinking of getting these filters:

GOJA 49-52, 52-67 mm step up rings.
B+W 67mm ND 0.6-4X with Single Coating (102) - B + W
B+W 67mm Grad ND 0.6-4X (502) - B + W
B+W 67mm Kaesemann Circular Polarizer with Multi-Resistant Coating

Decided to get the inbetween strengths because I can't afford to get more than one ND or Grad ND filter.

What do you guys think for a beginner? Thanks.

Kind Regards,
Andy