Wow, so sorry to hear this!! I get mad enough when a grit lorry sprays my car when driving let alone some bellend acting like that.... I would have knocked his head off!!
I would get it resprayed, don't mess about with chips away... And besides, he has to pay so go for the best option for the car, which is a respray! AND there may be slight dents that need to be flattened out...
As for the money side. Get a written wrote from a good repair place, go with the common mate that you both have to his house and give him the bill. Tell him that as is his fault he really should pay. If he doesn't, go to the police... It's vandalism at the end of the day!!
Good luck mate, hope you sort it!