Article rewriter needed - Long Term

Hi Guys, I need someone to write/rewrite articles on my choosen keywords. Following are my requirements. 1) All articles should be atleast 250 words. I will pay $0.5 per article. 2) They needed to be unique and should not be copied from anywhere. Rewriting existing articles is ok with me. I do not want Google to mark me as spam. 3) I need 60 articles and at this point. 4) Grammar and the sentence formation should be good. I dont care if you are native english speaker or not. 5) Work should be delivered on time and the payment will also be made on time. I only have Paypal but any other payment mode is also fine with me as long as it is feasible. 6) This would be a long term relation if I like your work. At the start of every month I would need these articles and as I increase my blogs count, you will have more work if you are interested. 7) Should pass copyscape. 8) Article content can be anything as long as you use my keywords. You can use your imagination however you want.I will give you the keywords once I select the bid. Please bid for 60 articles and I am willing to pay $0.5 per article with 250 words - also let me know the time you can diliver them in as I need them as soon as possible? If I select your bid, you can deliver all the articles at once or on per daily basis. Serious bidders only. Time is valuable and please dont waste yours or mine.