Well basically my site has a variety of backlinks but does not include private blog networks or article directories. It's PR1, and ranks Top 10 (only have 1 Top 5 ranking right now) for easy keyword, but for competitive ones usually around page 4-8. Do you think private blog networks & article directories will help boost them up? And is it worth the price? These are the most costly (I think) and I guess if they have great results it would be worth it... And which ones are good?