Both of those are pretty rare bikes. I'm guessing the F3 is based on the F1 which was a pro frame - probably just cheaper carbon = heavier. Not sure why you would be ok with Red but not Rival.

As for the Ridley, I've never seen a Damocles ever. People buy the Excalabur.

If I were looking for a stiff used bike, I'd look for a Cervelo R3. Which is what I did and ended up with. Frame will run you at least $1500 though.