Quality English Writers 500 word articles various topics

I have started my own freelance writing service as I now have several clients who appreciate the quality of my writing. I do however have to turn work away from time to time because I get overloaded. I am therefore looking for a quality English writer with good research skills who can write on any subject. Obviously all writing must be original and pass the Copyscape test. I will pay $3 per 500 word article if acceptable quality. I do expect to have to re-write these articles so I am looking for good original copy that I can knock into shape. If interested please apply with a sample of your writing, but be warned, I will ask selected applicants to write test article on a specific subject of my choice. This is however a genuine opportunity for the right person. I kid you not. I just cannot afford to jeopardize my reputation, and need the right calibre of writer.