Originally Posted by Campag4life

After much soul searching and testing Di2 and DA 9000, I have decided on DA 9000 and am starting to gather parts. I will tell you both are incredibly good. I am driven largely by hood ergos and there isn't a lot of difference between new DA and Di2...same hood shape. As to shifting difference, DA is so very good that I don't see a big advantage to Di2. So it comes down to ease of shifting and Di2 has be given the nod there...versus tactile feedback from the shifter and you can't beat mechanical in that regard versus a button and servo. Just one gearhead's opinion. Both are amazing. I will learn over time if Shimano nailed the firmness of the hoods compared to Campy. Shape of new Shimano hoods is very good but shape isn't the whole equation. Can only learn that over a thousand miles or so.

As to Tarmac S-works, I am thinking about building one a well as a stable mate for my Roubaix Pro which is an amazing bike.

In summary, I would say you are definitely on the right page.
Share the build here when you do it.