However, if you go with the Morphvox Pro software approach, what you're really have is one guy doing the voices of so many different people. So, it'd still be your voice but you might be able to morph your voice enough to where no one will notice this.
Another approach is computer-generated voices. Some of the really good ones do sound alot like a real person but there's still probably some instances where you could tell that it's not a real person.
Either way, both are going to cost you money. You might be better off hiring voice actors who might be willing to work for much less than what these software cost.