You can probably repair a cracked carbon frame for $300 to $500. You can probably buy a replacement CAAD10 frame for about $500. So unless your carbon frame is in multiple pieces, the cost will be similar. In a pinch, the Nashbar carbon frames are often on sale for $500 or $600.
I personally wouldn't bother selling a CAAD10 to buy another CAAD10 just for the different color and 11 speed -- the frame is still the same platform. However, maybe you'll enjoy the new bike more after a color change and newer groupset, so it'll be worth it to you?