One person has commented that the poll lacks the opportunity to vote for Barth's christology, which would be number one, I'm sure. Let me suggest that those who want to vote for christology place their vote for "reconciliation," since this is Barth's most direct treatment of christology. The doctrine of reconciliation manages to incorporate plenty of Barth's revolutionary moves which all center on the life, work, and being of Jesus Christ. Barth does not write in linear fashion, so I guarantee you that many of the themes you might have enjoyed in earlier volumes of CD pop up again.
Now you might think I'm biased, but I'm just trying to help out the average joe. I personally voted for Scripture, since it was the middle of CD I/1 that caught my eye at the age of 20. I didn't really understand the rest of it.