Yeah, it's down to the following choices:
Cannondale - Synapse Carbon 6 Apex
Cannondale - Synapse Alloy 5 105
Specialized - Secteur Elite Apex
Specialized - Roubaix Elite SL2 Apex
I've just about ruled out the Cannondales for their slightly more aggressive geometry, which I neither need nor want. So really it boils down to whether or not I want to pay for a carbon frame setup.