You really need to give us more info than this as I don't think anyone is in the business of doing homework for you. Tell us more about the firm and tell us what YOU think and we can help you and make recommendations based on yor designs.
I have a complete year wise(1981 to 2010) database of car models in US. I can provide Excel File.
You can contact me on my email id . I have attached sample Excel files, so you can decide. If you are unable to see in any case, I can send you.