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I shall attempt to answer your questions.
1. If you check out the Cokin range you'll see that it is huge and offers many opportunities to double-up a couple of filters. If you also use a Polar or Star filter, these are round and fit in the rear-most slot, but, protrude into the next slot making it unusable. So you could have a polar, a centre spot and a grad all at once.
2. Depends what you're planning on doing. I find the ND Grads are the most used filters in my collection. I don't think I've ever used my ND8, but I would definitely use a Big Stopper - if I had one.
3. Like everything in life, you gets what you pays for. Nowhere is this more true than Circular Polarising Filters. Here you need to ask yourself the same question, what are you going to do with it? If it's just to make the sky a bit punchier, you will probably get away one of the cheaper ones. However, if you want to do some serious reflection control the final image could suffer from a cheap CPL. Maybe the best advice is spend as much as you can afford. BTW, make sure you get a CPL and not one of the Polarcolor range or Linear Polarizer, these are different animals all together.
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