I think it is time for me to upgrade my groupo and have decided on 2011 Campy Chorus. Looking over the changes from 2010, the rear brake is now available in either single or dual pivot version. Is there a reason that i should want one over the other?

I probably have some time since I don't think 2011 Campy will be on the market for a few months. I might buy 2010 if there is some financial incentive to do so, but there has been some improvement such as better front dr shifts which might making 2011 worth buying.