URL:
http://pageproducer.arczip.com/mdyjc/BMW2002page1.html
establish fault first. Then they want to settle and close the books as much as you do. If their insured is denying fault, you must start there. The car is totaled, so forget cost of repair and concentrate on value of car at the time of loss.
You want them to admit fault, and send a claims adjuster. The car wants to look as if it were perfect at the time of loss. Don't remove parts or make repairs until it's adjusted. Most of the adjusters I worked with were reasonable if the car or shop owner was the same. Most of those who are not reasonable work for AAA.