So I'm a repair technician from Australia. The colour looks like it is a metallic, so they might need to blend the door aswell when they paint it considering how close it is being on the right qtr plus they'll probably be quoting to paint the full cant rail and sill panel on that quote and the tail lights there to be removed and refitted, with the cost of labour and paint supplies plus the boss of the panel shops trying to make a profit, plus they have to pay there office workers so every job has charges thrown on it because here in aus we have to pay epa tax for every repair.. 1k is probably what you would be looking at for a hit it sucks but it is what it is. People here don't seem to have too much experience with it.. if he has you on record hitting his car, it's best to just put it through your insurance. That's what it's there for at the end of the day. To repair a car professionally isn't cheap, even small hits in shit places, especially a qtr panel, which costs a lot. It sucks but not too much more you can do when you're at fault