Greetings.
By the sounds of the project posted, you are looking not only for someone who can write the plugin application but someone who can also design a user experience which is easy to use, and can be understood by any user attempting to use it. With the use of different advertising networks in different areas of the website, such a plugin has the potential to be very complex, yet needs to be simple for the user.
As a designer as well as a programmer, I am the person you need to have both a good experience using the program, and to get a program that works exactly how you want it to. I'm versed in HTML, CSS, PHP, and SQL interactions, the necessary languages required to make the plugin, as well as the native Wordpress hooks that will make the app work with Wordpress, instead of working beside it. With experience writing plugins, applications for mobile devices, websites, and small web services, I have the skills and the talent to complete your project in a fairly short amount of time without compromising on quality in the least.
I look forward to hearing more about what you're looking for in a conversation, and seeing what agreement we can come up with which will allow me to work with you and design the plugin you need.
Thank you for your time and consideration.
Justin A. Gough