Yeah I totaled my car at one point as well. Most likely as to the age as much as the damage. I thought about buying it back and getting it fixed, but the mechanic couldn't guarantee that there wouldn't be some underlying problem he didn't see when originally giving me a quote to have it fixed.
I did though negiotate a slightly higher amount than the insurance co. was going to give me. You could always try - do you have some pictures supporting it was in great condition? Did you do any work on it recently that might increase its value a little more? You could discuss this with them - it can't hurt in any case.
I went out and bought a car that was used after that. It was a sporty car and I bought it in the winter where it was buried below snow. Since sporty cars don't sell well in the winter, I was able to get a lower price. It is all in the negotiations.