Please give me names of Police cars that I can model for the game...
Also, if you know any good animation programs, please post.

You want to create a simulation game but add zombies jumping after helicopters and stuff?
And people most likely wont buy the controllers needed for this game unless it's cheap.

I think this game would be more suitable for computers (if you want the simulation aspect).
Else skip some of the features, instead of a computer to put next to you, press R2 (or similar) to open computer and just choose the call from the menu.
This way the normal controller will do.

I think you're making the game more complex than it has to be. Dont mix arcade and simulation, from the simulation aspect it will be unrealistic, and from the arcade point of view it will have unnecessary complexity.

I thought about what you said and have edited my plans NOT to include zombies. The arcade isn't in it either. But....the zombies is still a possibility in case we need an extra Punch to the game. I am currently designing a car for the game and its,come out pretty good. I am also crrating a short video demo to advertise the playable demo I will release sometime in 2013.