Creative Article writers needed! 10 Preliminary articles!

Ten articles needed on specialized investigation topic. Each article must be SEO and keyword friendly, and unique. Proficiency in the english language and a natural flow of the articles is very important. There should not be any grammatical errors present as I will only accept quality articles that read as if they were not just thrown together or blatant sales pitches. Articles must be informative, easy to read and enjoyable. I have the main keywords that I would like the articles to be written on. I would like the density of these keywords to be between 4% to 6%, however keywords should only be used where appropriate as the articles need to provide informative and interesting enough to drive traffic to the included links. The article length should be between 400 - 650 words. I will exclusively own all copyrights to the articles. I am willing to pay $3.00-4.00 per article. The timeline for the project is negotiable, however I would like the initial articles to be completed very soon following project initiation. Payment will only be released upon completion of all 10 articles. In addition the articles will be checked to ensure there originality as naturally no recycled articles will be accepted. I will be requiring a lot more articles in the near future in this niche, as well as similar niches, and thus am using this small job as a bit of a test for further work. **no need to bid with social bookmarking jobs, link purchases, etc. - this is the only type of work that I am looking for through this post**