Thanks ANOMOANON, rcriger and ChrisDouthit for the suggestions. I will be taking a closer look at ahrefs and maybe a couple others. Nohel, I have a huge list of tools that was posted quite a while back, just opening up a thread to hear/learn latest thoughts from the community.
My concern is when there is such a variance in results I am unsure which results I should trust. I will likely follow ANOMOANON's advice and use a combination of tools and look for trends.
In regard to varied results, here are the link stats from blekko and opensiteexplorer:
Site A.
5,132 from 97 domains blekko
12,314 from 73 domains opensiteexplorer.org
Site B.
3,061 from 152 domains blekko
7,716 from 75 domains opensiteexplorer.org
Site C.
2,005 from 383 domains blekko
5,631 from 761 domains opensiteexplorer.org