Got Rear Ended today

So I was driving to school today, and I stopped at a stop light, and right when I look into my rear view mirror.Bang. I saw it coming and I couldn't move out of the way, and my body jolted forward of course. A truck rear ended me. We get out and look at the cars, i have a ford focus, and really there is no damage just some scratches, and its a little loose. We exchanged our info and such. He said I had the option to call the cops or just figure it out through insurance. I called the cops just to get a police report to cover my butt and such. The cop gave me the choice of going through insurance or just take 3 estimates from 3 automechanics to figure out the price. I've been wondering what I should do and if getting the cops involved was the right thing to do. Since there really isn't too much damage. BTW it was my first accident so I was really shaken up. What do you think?