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A good choice and I've looked around, a new CAAD 12 frameset was another option but don't want to be dealing with adapters, BB30a and all that(?). I'm tied into my wheelset (powertap) and the groupset is mostly ultegra which leaves the frame and fork.
The current fork, with some headset bearings on, weighed in at 676g, so upgrading that and keeping the frame is another option but then I've put 15,500 miles into the frameset, maybe time for a change?!
Second hand CAAD10?
TBH, Cannondale are already pretty good bike, use the money for a decent race wheelset/tyres combo would be what I recommend.