i'd go w/ blue book and double it. you can report that. it would go on their record, and perhaps involve all kids of criminal negligence and other fees. they'd rather just give you money. don't let them push you around. take a witness. get him to admit that he was at fault (tape record if possible, use a small recorder in your pocket). then tell him you need X dollars to repair your mint condition bike. if it was mint condition, it's an antique, not a "junker" or anything like that. be sure they know that.