I got a new door for my 2001 Accord for 700, after paint and installation. May as well poney up for a new door, if you can afford it. If not, you should be able to find a shop that will fix that for cheap. I got my really messed up rear door, look just like yours, redid for 400 bucks, so it's possible.
Why are you limited to 400 bucks anyway? If someone hit me, there procedure is to get a police report if on public land or if the other person doesn't have insurance and is on private land. Either way, the insurance company takes care of it from there....