Def a good post and the themes you mentioned are some of my favorites. They are all built very well by some very well versed WP pros.

@Brad - hey thanks for mentioning WP-Forge. Although it may not have a lot of bells and whistles like some of the other themes, I designed it to be simple to modify for developers. I especially tried to make it easy for those individuals who are not developers and who want to try and create something on their own and learn something in the process not only about WordPress but about Foundation as well. Thanks again, I appreciate it.