go for the supersix. the savings alone will put you well on your way to a new groupset of your choosing. Then, you can turn around and sell the apex group if you like, too, to further help fund whatever upgrades you have in mind.

obv, try to give them both a solid test ride. If you REALLY like the ride of the CAAD better (and there are actually people that do), then you'll have more of a decision on your hands. Otherwise, seems like a no-brainer.