I've had good luck with Hoya filters. They seem to be a good balance between price and quality.
Here is a link to several options for UV Hoya filters. If you can afford it, I would recommend multi-coated filters.
Here are some Hoya CPL filter options.
The good news is that 58mm filters are more affordable than larger ones. The bad news is that not very many SLR lenses take that small of a filter, if you are planning on upgrading to such a camera in the future. I think my Canon 70-300mm IS lens is 58mm, but I only have a UV filter for it -- I have not found a need for a CPL filter on a telephoto lens. My other lenses are 72mm or 77mm filter sizes.