The C1R might be a downgrade. The C1 is the only one with hidden cables. The C1R is lighter and stiffer though.
we did a review on the ATC blog:
http://austintriathlonstore.blogspot.com/2011/08/litespeed-aero-road-bikes-archon-c.html
Wife rode the C3 most of this season and it has been great. Local MTB pro has been on the C1R and he has enjoyed it as well.