what I meant was, If the title of the page you are linking from and the title of your page you are linking to should match or be relavent. Titles should be of same topic. Hope you got it.
Regarding sig links, your niche forum links will give you link juice as well as targetted traffic.
say you have a site about cars. signature links from 3-4 car forums will help greatly, just make sure you go for the best related forums with pr4+. Start posting only in the new threads with incontent links pointing to your site( here also you can match the titles) (do not post in old threads).
I am not good at explaining,