The Chris King is still good, but has a weakness in the centring of the upper bearing due to CK's refusal to pay to license the Dia Compe patented split compression ring. There are after market hacks to add the split compression ring to CK headsets. This only applies to threadless headsets.
they now have a split compression ring. you can retrofit to old headsets too.
http://www.bikeradar.com/news/article/eurobike-2010-chris-king-tweaks-headset-design-for-2011-27701