Do your research
Hopefully you have pics of the car from before the accident. For those of you who don't, please do so immediately.
Dealing with insurance really sucks. They will come back with an offer, which will most likely be really low. They will have to send you details on how they came up with amount. For me, on the first pass, they didn't treat it as a GN, just a regular Regal, and tried to offer 3K.
So, then, they may come back with another offer, most likely higher, or so you hope. Again, they will need to provide you details of how they came up with the amount. Generally will have to provide you with phone numbers and adds of cars that are similar to yours.
When it happened to me, I called the people they provided to me and found out that one was not a GN, the other had been repainted a different color and had body work...again not similar. I sent in pics of my car along with autotrader ads showing what a car in similar condition in the same area are selling for (note must be in same area as well).
So, the whole idea is that they need to be able to provide you with a car that is in "similar" condition, which is hopefully where the pics can come in before the accident.
If they are lowballing, go to autotrader and pick out the highest costing cars that are "similar" to yours and tell them that this is what it costs to replace your car that was totalled.
It's a pain, but be sure to have your ducks in a row. Know the car you had and what it is worth and what other cars are selling for that are similar and maintain proof of that. They don't have to give you the highest dollar amount the car is selling for, only enough to buy a car in similar conditioin.. Alsol...be nice to the insurance agent...it sounds silly, since they are out to keep from giving you money, but for me, it went a long way.
If you have any questions, I'll try to help out...my car was stolen and I was able to get a fair price without a lawyer or appraiser, which is something to remember. If you have pics, you can always ask after a few rounds to excercise your right to an appraisal.
Best of luck
Chris