Google and Yahoo First page (top 5) Ranking

We are seeking the services of an SEO guru to improve the Google and Yahoo listing of an existing site (5 keywords / phrases). We currently have reasonable rankings but seek improvement. Our site is a single page site with extensive javascript PLEASE NO BLACKHAT OR GREY HAT METHODS, ONLY WHITE HAT METHODS Google / Yahoo guidelines must be followed and no way should be compromised. - Only white hat, experienced SEO should bid. - Backlink pages must relate to our site topic - No spam method can be use - No black hat and other unethical SEO Spam techniques. - No use of automated software or bots. - No links from under construction pages. - No java links, jump scripts, framed pages, redirects, cloaking, CSS redirects, 301 redirects, dynamic links, flash sites/pages, hidden links, no string parameters, etc. - No link farms, link exchange programs, and web rings. - No paid traffic sites. - No banned sites, porn, gambling, violent, illegal sites, etc. Please provide us the detailed SEO techniques you will use, and verifiable examples of completed projects you have done. Payment: 50% payment when site appears on first page for selected keywords 50% payment when site appears in first 5 sites for selected keywords . The Google ranking should be maintain indefinitely