Before you buy the gap insurance see if it is already covered by your current plan. When I bought my Scion, the financial people insisted that I buy their gap insurance at some ridiculous price. I made a phone call to my insurance agent and she told me I was already covered.
So, before blindly running out and buying the GAP insurance, just make a quick phone call to your agent. It might save you a lot of money.
Also, wait until the 07 SRT4 comes out. It will have 300hp.