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So, You Tube allows plenty of room from descriptions.  I think 5,000 characters.  Google does a poor Closed Caption of our audio.  Should I also be adding accurate transcriptions to the description field in YouTube to help my Video SEO.

What are the pro's cons and is it worth doing?

Thanks for the reply Dana.  I guess I was getting concerned over somehow the transcription being considered duplicate content.  You actually answered the better question of how should we deal with transcriptions in general.

With 700+ videos to transcribe, nice to get it right the first time.  The service we are considering is speakertext.com.  I believe they can automate the CC need.

thanks for the +1 vote on Dana's comments.  We did the first 80 videos transcribed via an elance contractor, but I think the service is probably the route to go.