The Campagnolo Bullet Ultra weigh 1,590g total

Yes, it's a carbon rim with an aluminium braking track

The Dura Ace C60 weigh 1,851g

Normally, I would go wheels first actually...I don't spend my time shifting. I do spend 100% of my time on the wheels though. However, in this particular instance, I wouldn't care about the Rotor crankset, Shimano's fine with me, so in that regard, I would find better value in getting the di2 bike then upgrading the wheels later on. I'd probably stick with a shallower profile too. That's personal preference.