I just got my car insurance on my Model S (picking up on Monday). I'm gobsmacked at how cheap it is. I called an agent my SO has used in Portland and he found an outstanding rate with Safeco. The policy will fully replace the car in the first two years, includes comprehensive and collision, and some other little things like even covers pets injured in an accident.
I currently just carry the basics and uninsured coverage on my 24 year old Buick (I didn't think collision or comprehensive was worth it) and the new policy for the Tesla is only $280 a year more than my Buick's insurance and the car is worth $98K more. I'm pretty happy about that.
I got similar quotes an Safeco from both AAA and this agent, but I like working with this agent. For anyone in Oregon or Washington, I'd recommend him.