Associate needed to help in choosing an e-mail list builder

I have a list of 20,000 dentists in the USA that needs to be expanded. Each dental record consists of first, last, address, email, website, etc. I also have 40,000 records with incorrect or old email address. I can provide, if necessary 150,000 more records of dentists. I need someone to help me find and EXPERIENCED email list builder. You can work right here on Freelancer to find a provider for me. Later on another contract I will pay you to manage the provider and get me the final product. I have a working associate who gets his lists made for ten US cents per record. So, that is what I want to pay. I cannot use his source as it will sell my list to my competitors. We should get this project done in a couple of weeks and I can pay an hourly fee because I don't now how much time this will take. If you help me with this you need some experience in going on the internet and getting up to date records. You need to be able to check out the person/company that will get us the email addresses. I am not talking about a few hours experience. I need someone who knows what it takes to get me thousands of dental email records that are up to date and work. Steven Tomczak, Ph.D.