For B+W, there is only the clear protector filter, 007 type, and the UV haze filter, 010M. No difference for dslr usage, but sometimes one is cheaper than the other. Important thing is get one with MRC.
UV filters have no effect for digital bodies, except to product the lens, but theses filters comes in different glass quality
all filters affects IQ, increase flare, and some even affects focusing, so if can, its best not to use a filter.