Copy writter/ SEO writter needed

We are searching for a talented writer who can takes on our challenge of writting a variety of topics such as lifestyle, entertainment, psychology, sex education, romance, dating tips/guide, etc. for a community/dating site. We need 50 articles and each article is about 500 words. Here are our guidelines: 1.) MUST be 100% original work (e.g. pass Copyscape)and WELL RESEARCHED. 2.) MUST be keyword rich that will rank at least within the first 2 pages of the search engines such as google, msn, yahoo, aol . Keyword density should be about 3.5 - 5%. 3.) The writer MUST CITE their work and/or link the keywords to another website, should he find the info on the web. 4.) MUST write in fluent American English. 5.) The winner must have a positive attitude. 6.) We own all rights to all work upon submission. 7.) Articles are to be in a variety of topics and will be discussed in details. Any recommendations from the writer are greatly appreciated. 8.) Upon successful completion of this project, you may be asked to participate in other writting projects. 9.) Must meet all deadlines and be able to begin immediately. 10.) Please send in one or two pieces of your work for review, or simply send a link of your previous work.