America's Tire Co. Wrecked my car. Advice and steps?

I went to get the tires changed on my car (2006 Honda Civic SI). Pretty straight forward, wouldn't you say so? Long story short, the tire guy bringing the car in was hit by another car. The driver side was hit and the air bags deployed. The damage looked pretty extensive. The manager and assistant manager assured me they were going to care of it. A claim was given to their claims office. After talking to the claims guy, he says if worse comes to worse, they'll pay me the value of the car.

Here's were I have some problems:
The KBB of my car is about $7.5k. I'm assuming that if the car is totaled, that's what they'll give me. Now I have to search for car and there's way more expenses involved in that. I have a feeling it's not going to be enough. Is there any advice or any certain steps I should take for the situation to be more in my favor?

I get my tires changed, they wrecked my car and pay me an insufficient amount of cash? That doesn't roll with me. They've severely inconvenienced me and I don't think a normal payout (like any other insurance would do) would suffice.

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