Sucks man, but I would hesitate sueing the bank. First you're going to have a hard time affording a lawyer thats better than a banks lawyer. Unless you can find one that's willing to do this for free if you don't win the case, you're going to waste a lot of money and time.

I would take them to small claims if they refused to pay for the towing, storage of the car, etc. But expecting to get rich off this is expecting a miracle.