My question involves a traffic accident in the State of: California

I was about a block from my house, stopped at a four-way intersection with a two-way stop. Both the road I was on, and the road I was waiting to cross are two lanes. The speed limit on both roads is 30mph.

When I had first come to a stop, I looked left and saw no traffic coming (can see pretty far down the road - about two full blocks. There were two parked cars on that road to my left, but they didn't hinder my view of the road much). Looking right I saw a group of three cars, (all spaced about a car length apart) coming down the road. The cars were too close for me to proceed, so I waited for them to pass, then checked left again and seeing no traffic, proceeded into the intersection.

I was only partially in the intersection when a tan car appeared in my windshield, coming from the left. I slammed on the breaks, but the guy was coming up on me too fast and not paying attention I'm guessing because he didn't hit the brakes and hit me full force.

His passanger side head-light area struck my driver side head-light, completely tearing the bumper off the front of my car. His car turned mine a full 90 degrees, and pushed me about 10 feet in the direction he'd been travelling.

The man in the car behind me was kind enough to stop and offer to be a witness. According to him, the guy in the other car came tearing down the road really fast before hitting me, and that even he hadn't seen him until right before the hit either. "He must have popped out of a side street and come tearing down the road or something" was what he said to me.

The kid who hit me lied to the officer and told him I'd run the stop sign, which isn't true, at which point my witness went over to the officer and told him that I had stopped at the sign, and that the other guy sped right into me. I was pretty addle-brained at the time (doctor I saw later diagnosed a mild concusion from my head striking the driver's side door and window) so I don't remember 100% what I told the officer, but I know I kept saying "I looked TWICE, I don't know where he came from!"

Despite having received a mild concusion, I managed to remember to take several pictures with my cellphone. In one of them you can see the position of both cars in relation to the curb I had been stopped at.

While I realize my witness is not an expert, I'm wondering if his statement, my statement, plus the photos showing how far my car was spun and pushed is enough to show negligence on the part of the other driver?

I'm still waiting to get the final police report (they said to call in a week), though I think they may have done an incident report, and not a full accident report. Like I said, I was pretty out of it at that point, so I don't recall seeing the officer measuring any skid marks or taking pictures... but I'm not sure.

Until yesterday I'd never been in and accident, and never even gotten a speeding ticket. I'm an extremely defensive driver, and I'm really irritated that my prefect driving record is now ruined.

His insurance company called me today but I was in class so I am calling them back tomorrow morning. I intend to be completely honest obviously, but is it better to say a lot or a little in this type of situation? Any advice, information, tips, etc. are welcome.

I'm not trying to screw the other guy over, but I really think his speeding caused the accident, and I want to prove that as best I can.