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.
Amanda
2011 Specialized Epic Comp 29er | Specialized Phenom | "Marie Laveau"
2007 Cannondale Synapse Carbon Road | Selle Italia Lady Gel Flow | "Miranda"
You don't have to be great to get started, but you do have to get started to be great. -Lee J. Colan