I wouldn't do anything else at this point unlsee you have a small room or cost issues. If you have a 5.1 dvd matrixing the back channels to 4 speakers fills the room that much more with sound and blends it, unless you happen to one of the few people that can have proper imaging on the rear speakers. But I haven't seen one yet they usally get thrown agenst a wall or in a cornor.
