Nice find (ACL in router), but it did not address my issue. I hope it helps others.
My issue is fixed however. My iPhone 5 was replaced under warrenty, and I have not seen the problem since. I can now connect to any router I want and do not seem to have a problem. This, unfortunately, helps nobody. Apple, Apple, help?!
Edit Reason: Clarification -- My iPhone 5 was replaced under warranty for an unrelated (messed up lightning port) issue. Apple did not warranty replace my iPhone 5 because of this WiFi issue.
Edit Reason 2: Spelling & grammatical corrections.