Its time for me to finally invest in some good quality filters. But, i have never seen so many for sale. Some being cheap as heck and others being hundreds. I want something for skies. To make them look more dramatic. So would i therefore use a polarizer or ND filter. -Good company and rating (.9 ,8 .7) ND filter. -Polarizer? -Infared. Im going to be getting 67mm filters.