I'd say he's a lucky guy now. If he had not born into such a rich family, he wouldn't get a D300. I hope he won't turn into a spoil kid by not making good use of the camera.
So what should it be? A kid who knows how to handle a DSLR well deserves a DSLR above mid range or a kid who know nuts, got a rich dad n buy him a D3x?
Hard to judge nowadays. Only think u can say is "Why ain't I the smart kid who handles a DSLR well, good @ color n compositions and has a rich dad that can buy me a D3x?"