[Markulous]

I'm not up on knowledge of filters - but for my photography it's totally unecessary. I only use UV and Polariser and whilst there are fairly significant differences between "good" and "not so good" (material, coatings and thickness) the only thing I ensured is that it's a circular polariser (linear ones don't work too well with dSLRs)!

So, I'd recommend UV and Circular Polariser - Hoya's as good a make as any (and what I use!). Potentially, you might want to get something like ND Grads in the future (I'm thinking for your sunrise/sets)