After reading my "Understanding Exposure" book I bought last week, I think it would be a good idea for me to get some ND filters. After doing a little look around on the 'net, it seems Cokin are a reasonable compromise between quality and price for a beginner. So I'm thinking of getting the P series holder (and adaptor ring), but I'm still not entirely sure which filters I need/would use. A ND8 (3-stop I think) hard filter would do for me for when I want to slow down water shots and a gradual ND8 for bright skies. I don't think a ND2 or ND4 hard filter would be needed if I had a 3-stop one anyway, but different gradual ones might be more useful.
So, what are people views on this? Any help would be appreciated. Cheers.