Some input... I ride a Cannondale Supersix 52 - its the "mens" version and I have no issues with it. Men's bikes have better resale value and the differences are small, especially if you want that aggressive race position. I'd recommend switching out handlebars for 40cm vs 42 or 44 that come with bike.

My friend has a CAAD 10 in a 56 and it is an awesome bike. I would suggest thinking about SRAM rival - it beats 105 and Ultegra hands down. I have Dura-ace but if I was replacing or rebuilding my bike I would go with SRAM red or rival. My bike is team sponsored, and if I end up needing to buy one, that CAAD 10 has my name on it!

The Amira is cute, but I would choose high grade ALU over cheap carbon ANYDAY