SEO - ADULT WEBSITE - $6,720

I require the services of a professional and experienced SEO freelancer to gain high search engine positions on yahoo and google for 2 competitive keywords. For this I am willing to pay approximately $6,720 on a performance basis. Payments will be made on a monthly basis and will be approx $280 based on continued performance of the site, totalling $3,360 for the 1st year. T he remaining $3,360 will be paid monthly over 2 years. The success of this project may lead to further similar projects. The website used to rank at number 3 on google for the term "adult dvd" for a period of approx 6 months, for some reason this was affected and the index page doesn't show up at all for the term. I want 2 create 2 new pages on the site to rank for the keywords "adult dvd" and another for "adult dvds". This project will require link building, social networking, blog postings, forum postings etc in a very natural looking way and should not be rushed or any blackhat techniques be employed. Anything that is done that damages the current position of the site or goes against what is specified will result in termination or our agreement and re assignment with another freelancer. Serious and experienced SEO experts are required for this and people without the necessary skills need not apply.