OK, I've read through a couple of the threads on this board discussing similar topics but I'm still totally confused as to what I should do. I recently purchased a Nikon 17-55mm f/2.8 (77mm mount) and need to get some filters for it. 1) Should I purchase both a UV filter and a Circular Polarizing filter? I assume if I'm outside most of the time I'll have the CP on and don't need both? Can you help me understand when I'll need a UV filter (I understand the lens protection argument, but what about for UV protection) 2) Any recommendations for filter brand/models? I see slim, multi-coated, etc.. and really don't understand how it will alter my IQ. For now, my budget is probably somewhere around $100/filter. Thanks!