Right now I only have 2 lenses. I know that different situations require different lenses, but what if I only want to carry one lense most of the time? The 70-300mm is tooooo long. The 17-85mm IS is a great lens. But I don't think I need something that wide all the time, and I would like a little more zoom. I was considering the Canon 28-135mm f/3.5-5.6 IS USM. Still semi-wide, and it gives me a little more zoom. Does this seem like a good all around choice?