Originally Posted by Sausage

I could put you in touch with a friend of mine, though I think for what you are after he would charge at least $50k.

I suggest if you are just after some site optimizations any old SEO monkey with some knowhow can do it, its more about what you get wrong than what you get right. If you are looking at actual SERPS strategy and plans plus inside information on getting prized listings then be prepared to part with some serious money. 6 figures sounds about right.