They're all in DTS, mate, but yes it is a great soundtrack.
After ordering my Jap version from CD Wow, I have now reconsidered and have cancelled the order. I feel sure that an unrated version will emerge at some point, and now that I've seen a UK rented version of the film, I'm not really in any rush to buy a version which is still relatively expensive, and you have to manually switch the subs on and off. I'm going to wait to see what happens next.