frank vincent is a great choice - atleast have an italian play the role right. I mean James Caan, Richard Bright, Andy Garcia are some who arent italian and were in the godfather trilogy-even though they did good jobs. what im saying is that we need to mention some of the good italian stars-pesci, liotta, paul sorvino and some of the guys from the sopranos like tony sirico and michael imperioli. I would definitely give them parts in part IV before segal or keanu reeves because these guys have experience doing these gangster roles.