Specialized S-works carbon. Non-negotiable though.
Ah. I was going to suggest something like Cannondale SiSL2.
I've got other cranksets I could use, including a Cannondale SISL non-2. But I've also got the S-Works crankset with a Quarq PM and they won't work on the next few frames I've got planned, so they're going on this bike come hell or high water.
@Emyr started
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Specialized S-works carbon. Non-negotiable though.