Interactive marketers have more choices than ever when it comes to picking media buying partners. Once dominant, media buying agencies now face stiff competition from a whole host of new specialists who've emerged to fight for clients' digital media dollars amid transformational shifts — like the rise of audience-centric buying — in the digital media buying ecosystem. This report details the range of choices now available to you, gives practical advice on how to choose the right buying partner model, and details the key qualities to look for in any buying partner you're considering.