Writer needed-again

I need a quality article writer. I need only those who are serious to work and have high English writing skills. When you bid I need you to provide me with a sample of 350-400 words on topic of my choice. Your work should ALWAYS pass copyscape, have no grammatical, spelling, or structural error. Make sure you check your work before sending it over. Payment will be upon approval of articles by the buyer. I am looking to establish long term business relationship so only serious bidders please. My rate will be fixed at $1.5 per 500 words for original articles and $0.5 per 500 words for rewritten articles. I need someone who can provide me with a minimum of 5 articles of 500 words but if you can provide more articles then states this fact in the PM and you will be given preference over others. However, keep in mind that HIGH QUALITY WORK is a must. And Please ONLY SERIOUS BIDDERS, who are able to reply back to me in timely manner and not DISAPPEAR after accepting the job. I am really fed up of such writers ho accept the project and then dont send me the work I assign them. I DO NOT HAVE TIME TO RUN AFTER SUCH WRITERS. When you bid state "Sample will be provided" so that I can be sure you have read everything and understand it as well.