This is an awesome and informative thread! Great advice! Definitely, book a photographer based on their work, not the packages they offer. Most everyone should be flexible to work with you. There are quite a few photographers who will and some who will not give out the digital negatives no matter what. As far as 2 photographers, we shoot together for many reasons- extra angles, different perspectives, more candids, can bounce ideas off each other, etc. It works great for us!
Katie