Which one? You've tempted me with that Cannondale. Only a little more expensive than the Datum and they've been doing carbon a lot longer. Having to go for the Medium Datum frame worries me a bit too. Then again so does the odd seatpost size of the crack'n'fail.
DJ has that dale in 56 I think, only reason they are cheap is because last year's model. Worth noting that it has 25.4mm seatpost that is not easily available.
No idea. Although I see that my horse is winning ;)