CAAD's aluminum (presumably with carbon fork), though. The Madone is full carbon, so of course it's going to cost more.

If you can find one in your size, do give it a shot, though. DBF says his R2000 (the forerunner to the CAAD series) is a much nicer ride than his old Giant (basically, my bike), though how much is due to the higher-quality aluminum and how much was because of other stuff, I don't know.