I guess it would be a good driver, but I really like a good original car.
One day I would like to do a 67-68 Mustang Fastback. But I would start with a good solid CA car that was as original as possible. They are only factory correct once, and thats the appeal to me.
But yeah a modern SL550 would smoke one, and you can drive the SL550 every day. Plus you can do nice things like idle in traffic and blast the AC!