I have the Alpha X on my IA, and I love it. If I were buying now, and it were available, I would get the new Alpha. One of the minor details about the basebar I like is that it has a rough grip at the brakes, which means I do not use bar tape. It looks really good. And supposedly, it is one of the most aero.
If the frame comes with an uncut steerer tube, then you can pick your stems at will. If it is cut, then you are pretty much constrained to the Tririg stems (Sigma or Alpha integrated) and the Felt stems. I do not like the base Felt stem, but the Dagger is pretty cool.
What drivetrain are you running? I assume you will go electric, but which flavor (eTap or Di2)? If Di2, hiding the junction box and wires are manageable. If eTap, then you want to think about where you will put the humungous Blip Box. I would consider this in the front end choice as well.
I don't want to wait for the Alpha One and I technically the Alpha X has less drag. I was going to talk to Felt about the Dagger stem and that is one Josh A. use with his Zipp Bar. What stem are you running now? If I can get the TriRig stem flush it seems like a very good option.
I just picked up a eTap on cyber Monday at 25% off but still am considering Di2 (which i have on my other 2 bikes). Will switch to 165 cranks (Steve Jackson has talked me into this) and prob go with a quarq Dzero.
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2019: IMTX, Rookie, 70.3 Worlds, Lifetime Oly