I have great respect for Harvard, but I firmly believe a full ride to USC is a better option than full pay to Harvard, in this particular case. As the OP previously mentioned, the $200 grand can be applied to the cost of med school.
It’s easy to be tantalized by the prospect of attending a very elite university, but USC is no slouch and will save major bucks. If the cost of both schools was roughly the same, Harvard would be the obvious choice, but the cost difference is substantial.
I would choose USC without batting an eyelash.