I bought my proofs ahead of time for $225 and it was the best thing I did for the wedding. We had 115 pictures taken total, but a lot of them were requests from us for certain poses, in addition to what the photographer advised on.
And yes, guests can bring cameras. I did not allow cameras at my intimate, however since we had a photographer and videographer and I trusted them to capture the moment. I figured if even two of our eight guests were snapping pics, it would be a distraction (standing up, moving around, leaning in front of others) and some would be more concerned with their cameras than enjoying the ceremony. I had the rule of "if you wouldn't do it in a church, don't do it at my ceremony," and I know neither families pop out cameras for a church ceremony. It worked out very well.