I Suggest you use either Meguiers heavy duty or Mothers Powerball 4 Headlight Headlight restoration kit. :) I know the Meguiars H-D works well as i have seen others use it..
At least its fixed now which is a good thing and it didnt cost you thousands :) Like you said, keep monitoring it for the next few weeks and see how it goes..
like the others have said, its better to lodge a claim through the insurance company. That way you know that you dont have to do much running around. Also was the other persons car damaged? if so then their vehicle will also need to be repaired.
Other things to add to the list... Drivers doing 10-20 kms below the speed limit in a over taking lane... (especially Taxi's) Slowing down for no apparent reason.. Signaling to turn right at the very last minute in traffic......