It is amazing how little evidence exists about prevention of CVD by shifting to omega 6 PUFA

http://onlinelibrary.wiley.com/doi/10.1002/14651858.CD011094.pub2/abstract

You should read at least the abstract before buying a liter of sunflower or corn oil for cooking or seasoning your food.

In the world of little evidence another observational study:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3886748/

In this table DPA is the winner:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3886748/table/tbl04/

This table about seafood is impressive:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3886748/table/tbl07/

Eventually a great paper of D. Mozaffarian
http://circ.ahajournals.org/content/130/15/1245.long