I can't remember. I have an ND8, ND4, and ND2 plus a circular polarizer. I usually use the polarizer first and then if I need more I'll add an ND filter to achieve the shutter speed I want.
ND filters are cheaper than polarizers. I bought my last set from OEC on ebay. [link] I always start with my polarizer first because it makes the colors more vibrant.
o yea thats way cheaper than the ones i found, i was checking out the "lee" filters and not on ebay, ill definitely be investing in those as soon possible.