aristotle - 12:01 pm on Aug 14, 2012 (gmt 0)
In my opinion the overall backlink profile, as well as the distribution of anchor text, should be the main considerations. The problems arise if most of the backlinks are of the same type, such as blog comments or directory listings, and/or if the same anchor text is used repeatedly. I wouldn't worry about "linking page authority" at all. In fact, I think it's good to have some backlinks from small obscure sites with no pagerank, since these won't appear to be purchased.