I want to have a custom set of sidebar links per Page of my site so that these links can act as my second-tier navigation. For example, I am building a running site and have top level pages for Training, Nutrition, Races etc. When a user clicks on one of those top level pages, I then want to have a sub navigation via the sidebar links. For example, if a user clicks on the page for Training, I want that sidebar to have custom links for Training for Beginners, Speed Training etc. And if someone clicks on a different top level page such as Nutrition, I then want the sidebar to have custom links such as Race Day Diet, etc.
Can anyone recommend a simple yet effective plugin for this? In short, I want a plugin that lets me customize the sidebar links for every page of my site.