I'm shooting my first wedding next week and have a few questions. I'll be shooting with a 5D and 20D, primarily with 2 lenses: 70-200mm F/2.8 IS and the 24-70mm f/2.8. It's a indoor wedding at a church. It's a typical church with typical lighting. I'll have a 580EX flash mounted on the 5D and probably use the camera flash for the 20D. My questions are, what ISO should I go with. I know I'll have to test it when I'm there before the ceromony starts but typically what ISO is best for indoor weddings? My second question is what aperture should I choose. I want to go as wide as possible to gather as much light as possible but also want to be able to get decently sharp shots. Would f/2.8 or 3.5 suffice or is that too wide? Thanks inadvance for the tips.