Where does diminishing returns start to kick in when purchasing a bicycle? You know the point where the performance increase starts to be of little return for the investment.

I currently have a 1989 Cannondale road bike, owned since new. It has all Campy Nuovo Record components (even older than the frame) except the cranks which are Veloce. What would I have to spend to get a comparable bike?

Sorry if this sounds confusing or more likely stupid!!

Thanks,

Bill