There are no SACD units I know of yet. Haven't heard of anything on the horizon either. DVD-Audio is either starting to come out or has a little bit already. You can find the 5.1 decks without too much trouble, but I don't know if your wallet will like it. I'd love to have a DVD-Audio player in my car too, but I'm not sure if it's worth it over the other forms unless you really get into deadening the car.