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Also considering 7800 yeah and have some of the group sat around just in case, I know functionally it's awesome but I prefer aesthetically the other groups so it's rather at the back of my mind.
If I go with it I can't imagine i'll use the 7800 crankset but as @PhilDAS says some more classic cranks. I've a few Specialites TA Zephyr cranksets put aside for that eventuality, like these but the double versions:
10 speed 7800?