A best link according to Google guidelines is one that is taken from a website that is closely relevant to your site, have good PR, Not more than 20-30 outbound links and no mix links. If you could find some links fulfilling these criteria you will be highly benefited.
Yeah I agree about getting links of related blog networks. With the system I use in my signature I am able to put an unlimited amount of backlinks to my websites and they are permanent links too. Well worth the money I pay as I can use these links forever.