I am looking into buying a new lens. My current two lens I have are the 70-200 2.8 IS which I love! Especially during wedding ceremonies. But, in my small studio it is hard to use especially on kids and tough on my arms! So the lens I use mostly is the kit lens 17-85. Now that it is fall I am getting a lot of darker images outside and my family shots indoor at weddings are a lot darker. I have the 580 flash, but I am not always very happy with it. I am constantly having to lighten my pictures. I need to have it check out to see if it is working properly. I shoot raw so most of the time it isn't a problem, just annoying! But anyways I am needing to get another lens so I can hopefully use my kit lens for a backup at weddings. I like the 17-85 especially when doing kids and seniors so should I just look for a faster lens? Any suggestions?