Time and time again these guys have great ratings with Google checkout and deliver a top notch radio commercial and radio advertising product to their clients.
Another top rated company that has a massive selection of voices for radio commercials (more than 10k) and stands behind their work.
3) Satellite Radio Advertising
If you want to reach a national audience this is the company to go with. Top of the line radio commercial production and experts that know how to advertise on satellite radio .