I currently have 24-70, 70-200L, and a Sigma 50 1.4. I was going to get the 17-40L but then Canon announced the new 100 macro. I've rented UWA's on occasion but have never used a macro. So my question is this: Which would you have more use for, a UWA or a macro lens? I know that the two lenses fill two entirely different purpose and it really comes down to personal shooting styles, but since I'm having such a hard time deciding I thought that I would find out how others would choose. Thanks.