I'm out on a limb I know, but aside from a few basic links, I forget all the effort on getting links. Article quality and relevance work a treat for me. The whole area of linking has become so manipulated that surely, surely, Google and the others are aware that they are being manipulated? The manipulation has been going on soooo long. My advice is forget links, write short articles on specific subjects and keep the navigation flat. Beats link exchange stuff all the time. And it saves a whole pile of money hiring SEO experts.