Link Building Project

I want some one with good and successful experience in link building. Pretty much building high pr links to my website. YOu need to have verifable U.S clients that you have worked with , with good success on the link building process. The website in question is already ranking well in all the search engines, I just need to take it to the next level. Please include your proposal with website you have with on the past, what you achieved, and how you will create successful links for our website. Thank you. Please do not bid if you are simply doing directory submissions, or using Angela's Backlinks. Same for if you simply create and distribute an article to article directories. I am only interested in those who are capable of building good PR links, and have connections with blog networks to get contextually embedded anchor text focused links.