Do not underestimate the value of relevant links, even if their page rank is low. Our experience (my husband is our webmaster) shows that a high-quality link coming from a low ranked but relevant page is many times more valuable than a not-related high rank link.
Beside the important role of links to search engine rankings, links are also a nice traffic source. Our site receives about 500 visitors daily, 60% arrive from search engines, 25% from links and 15% are direct visitors (people that specifically type the site URL in their browsers).
Of course, highly ranked relevant links are the best. However, these require a lot of time and effort to get.
Sarit.
http://sarit-jewelry.com