My personal opinion. If I had a carbon Madone, I would go with a carbon compact, not alloy. That's just me. I would probably go with an FSA SLK MEga-Exo compact or similar. 55/Rad has one on his 5500, and I really like the match. Ritchey compacts are very nice, but to me, it just doesn't seem right on a Madone. But hey, to each their own.

Good luck.