Instead of trying to find the best backlink type, and risk that it will loose their power after next update, is it better to bundle all high quality link types then point them to your sites???
Introduce…

Here is the Plan :
Step 1
We will create 400 words++ Spun Article with 70-90% Uniqueness (According TBS) then place your links inside.
Step 2
We will Submit One Spun article to 700 – 900 Article directories. You’ll get at least 100++ Live Links. More links will follow once The administrator approve it.
Step 3
W will Submit One Spun article to 15+ Web 2.0 Blog or Social Network sites such as WordPress, Live journal, Thoughts, etc
Step 4
We will Submit One Spun article to 250+ Wiki Sites. Some Wiki sites come from High PR Website included .EDU Wiki sites. (Yeah… Contextual .edu links!)
Step 5
We will Submit Your site to 150+ Social Bookmarking Sites. You’ll get the Exact Bookmark URL Reports (Not just the Profile URL)
Step 6
W will Create 100 Anchored Profile Links pointing to Your sites.
Step 7
W will gather All Links from STEP 2 – STEP 6, Then we will submit it to Lindexed for higher crawl and index rate! No doubt if your links will be useless if Google can’t find it.