I found this article to be most helpful. Trying to figure out the best solution between sub.domains vs. sub/directories was so confusing, but after reading this, I now feel I have a better handle on the subject matter. One thing's for sure, there's no one right answer. It all depends on how you want to approach and position your blog. So, after giving it some thought, I now know I want to build trust with my main site, reinforce the brand of my main site, and use my blog to publish content related to my main site. So the best solution for me will be to use a sub/directory. Thanks for this great post!