I have had a couple of 911s - a 996 C4S and a 997 C2. I would never underestimate a 911 because it is a great car, and offers many things a supercar doesn't.
With regards to the 430, that is not really a comparable experience. It is less usable, more inspirational. You feel the F1 history.
I have never driven a scud but own a 430 Spider and a CS. The CS is very different from the 430, although it is not true to say that after driving CS/(Scud?) you would never drive a 430. The 430 is more civilised and makes a fantastic ultra-sporting GT, whereas the CS takes much more commitment to drive long distances.
The two are different in character and one doesn't replace the other.
However, If I had to sell one? Well, the CS is a keeper - it is a remarkable car in every way, really, really fabulous, I have never owned a car like it. It's beautiful, raw, well made (unbelievable but true!), fast, rewarding, engaging....
You get the point.