I want to record a lecture in a huge concert hall...actually more of a theater. Anyways I can't decide what I should use. The iTalk and the Belkin both have microphone adapters, but the iTalk comes with built in mic and speaker. I guess that would be the better choice. Has anyone any experience with either of these? Also can anyone suggest a tiny external microphone to use with one of these? Maybe something i could clip to my shirt as i'm sitting in the theater?