BB - Interestingly enough, the one book you didn't mention is my favorite of Dan Brown's - Deception Point. I thought the DaVinci code was just fine. Angels and Demons, on the other hand, didn't really build any suspense for me. Digital Fortress was decent, but a bit odd for my taste.
I'm a fan of Robin Cook as well. Coma is the only one I know that was a feature film. A few others have been made into TV movies, but with mediochre results.