feel free to upgrade if you wanna bling yourself and/or your bike. but a headset that works fine isn't much of a thing to be upgraded where performance is concerned, especially a headset as good as the one you're starting with.
if you do upgrade the Seven, keep the Can Creek and put it on the cross check.
Or just buy another Cane Creek and stick it on the Cross Check, and keep running the current Cane Creek on your Seven. You could hand-paint it with nail polish if you want it to sparkle.
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"c" is not a unit that measures tire width