Echo that! CAAD is my first thought. Fine lightweight frame suitable for all road riding. Very, very reluctant to but used carbon anything unless it’s from someone I know.
Just to throw a spanner in the works, but as I understand it:
-lightweight aluminium isn’t necessarily more robust than carbon, especially when frames are a similar weight. Caad is light because walls are thin.
-aluminium has a shelf life and can become brittle.
-carbon can be repaired, aluminium can’t.
You could argue the case for aluminium being more robust only applies to the frames that weigh more. Bikes like the caad pushed the weight boundaries as a cheaper alternative to carbon. Having had a Caad12 it didn’t feel like it would’ve taken a hit anymore than carbon frames I’ve owned.
A giant TCR advanced would be light and robust. Not the most exciting but a solid workhorse that does everything well.
I wouldn’t rule out a used carbon frame (maybe not one from a lower cat amateur racer mind), but I also wouldn’t automatically assume a lightweight aluminium is safer.