Does everyone generally use a filter for their lens? Is it really necessary or is it being on the cautious side? I have a 50mm 1.4 and a 10-22mm and since I like my lenses, I'm considering filters only because I don't want to unknowingly hurt my lenses in the long run. Besides dust that gets in, I usually take cap off, shoot, cap back on again. I keep my stuff in a bag, so it's not like I take out and roll around in bushes with my camera.
Any recommendations on filters I should use? I'm not really looking to do any special effects, just a precaution if that's needed. Otherwise I've heard bad things about cheap filters, so I don't want to buy a crappy one.
I honestly don't know too much about the technical stuff when it comes to the camera, especially when it comes to maintenance. All I have is a little brush squishy thing for me to get rid of visible dust particles. I'm usually really anal with my stuff, in this case I don't know enough to know what part I should be anal about 
edit: Ok, I got the B+W 77mm UV multicoated filter....is there anything else?

