Is this to be a largely text-based ad? If not, you may get better results by posting it in the Design category, as not all copywriters have a flair for creative design.
Hope you find what you're looking for,
Ann, can you advise what you mean by national press: tabloids, b/sheets, national magazines, insert magazines like ST for example?
Keep in mind that you have more chances to win a Job with Case Study as fewer Sellers will send a proposal. Moreover the Buyer has already paid a fee for it, which shows that they seriously intend to award the Job.