Two words: "Search Function". For that matter, why not check the appropriate forum? There is one dedicated to questions concerning ordering cars. Finally, please note that bumping a post after only one hour, particularly when the post is of no real urgency, could be considered extremely poor form.
If you do use the search function, I am sure that you will find many examples of people paying about $1000-$1500 over invoice. And always remember to negotiate the car price, not the payment amount.
Best of luck.