Wheelbuilder is throwing the GS in for free for carbon wheels that start at $2K, though a Flo 90 equivalent by zipp or Enve will cost more. Still, worth bearing in mind as you mull your options.

Wife won't go for that. Thanks for the suggestion.

I am doing a GS / Chinese / 88mm build.

It's my best / only option open to me - rims should be here soon, wheel builder on standby ... :-)

WD :-)

I just got the exact same setup, haven't built it up yet though.
I expect this wheel and an Aerojacket will be as fast or faster than any disc wheel.
Wheelbuilder has wind tunnel test data where the Zipp 808 wheel + Aerojacket is the fastest. Flo 90 should be equivalent.