Hello sir,
As you know after google pengium and panda SEO is not easy work bcoz if any body create spammy links , google don't approved these links and he dropp ranking of your site, which you have already.
What we do in complete Link building =
1. The most thing we need to create some high quality one way links from only different IP's, this is main thing which google see
2. Relevant links we create
3. We put links only in those sites which is google cached
4. Where we put your site links, you found releated links on that site
waiting for your positive reply,