If you like Carbon you might think about the Cannondale Synapse or Specialized Ruby (if WSD works for you). I ride a WSD Cannondale Synapse which is a relaxed racing geometry, the Ruby will be similar. The CAAD5 is aluminum (I believe) and Cannondale is known for a stiff but somewhat harsh ride on their aluminum bikes, they are built for speed. The Synapse is designed to be more comfortable but still have a bit a racer in it. After nearly 2,500 miles since I got her in December I am quite happy.

Of course the Madone is a wonderful bike and I don't think you will find many (any?) owners that don't love their Madone.