Article Rewrites - On going project

I need someone to rewrite some articles that i choose and make the content my own. I will provide all writing content, examples, keywords, etc. I just need you to rewrite them for me. For this current project i am looking for 20 articles with 500 words, 4% to 5% keyword density. I am looking for a writer to work with on a long term basis. Please have experience with sales copy, internet marketing type copy, and affiliate sales copy experience. PLEASE NOTE I WILL DO ALL RESEARCH FOR THE COPY ALL THAT IS NEEDED IS FOR YOU TO REWRITE THE COPY I GIVE YOU.