Yeah, all of these guys are great choices. Especially Raditz. But I think another really good one was Nappa. All he really did was serve as character development for Vegeta, to show how evil he was, if you think about it. He was an evil planet conqueror though, just like Vegeta. It would have been interesting to get more development from Vegeta though, from Nappa. And maybe even other Saiyan's, since Nappa was the only Saiyan that was an adult before Frieza blew up Planet Vegeta.
"Why is everybody so ****ing stupid?"- Kim Jong Il, Team America.