If the car ran into you, have his insurance buy you a new tank. If you ran into the car... you can get tanks cheaper on eBay than most any shop will charge to fix it. And, FWIW since this is LA, just about any shop will promise you the moon and you'll end up dissatisfied with the final product, when you finally get it. It's sorta like this
I high sided two weeks ago, and happen to be getting my lightly scratched tank back from the shop when I pick up my bike, since insurance replaced it. The only mark on it (no dent) is about a 3 inch long scratch on the left side right next to the honda logo. I will sell it at a very reasonable price. I am in So Cal so it will be easy to get it to you, and you can have it repainted. It is currently painted in the 2005 black.