To the OP: I haven't read the entire thread (it's just too long at this point) so this may have been mentioned already, but in case it hasn't - you are entitled to the car at the winning bid price. When considering the legal costs involved if you were to pursue legal action keep in mind this case could easily be a deceptive trade practices case in which case the damages awarded would be TRIPLED. The dealership has a lot to lose here. They should pony up!
You really need to get a lawyer involved to make sure your rights are protected. There is a good chance a lawyer would advise you to avoid posting more about this case on the internet.