Content Writing, Require around 350+ articles a month, 300 words each

Hi, I own about 100 website that require content on a regular basis. I require a minimum of 400 articles of around 300 words a month to be posted on them. The articles can be from different areas of interests topics. Qualities required: 1) The content should reflect that a little research on the topic has been done. The grammar should be spot on. No grammatical mistakes accepted. 2) No spun content please. Stay away if you generate content refurbished by article spinners. 3) You should be able to deliver the articles in the range of 20-100 a day. Though the average number of articles required each day will be 20 but at times it can go up to 100 or even more. 4) The website are not for money sites so that content doesn't have to be very engaging since it not meant to drive sales. Only requirement is a little research and perfect grammar. Non native writers with good english skills are welcome. 5) The payout will be 70-80 INR or 1-1.15 USD per 300 words of articles. That rate is most i can pay for the quality i accept and the bulk of articles i am looking to be written. So if the rate is not acceptable to you, please don't bid. 6) The writer or the company should be able to work on the project for at least 6 months. I am looking for a very long term partnership. Please read all the instructions and if you understand and agree, please post your bids. Please also link your samples of previous work, so i can gauge the quality of content beforehand. Thanks and all the best.