The movie itself is not worth buying again just to have a better DTS soundtrack IMO. As for the video, the DVD I have is just fine. it has sat in my cabinet since the day i bought it so when we say we won't double dip, it means it's not worth buying even if it is improved. The movie blows to be honest. Too long, too much love story.
Although I like to check out DVDs people recommend for superb sound, i have to say the movie has to be worth watching to waste my 2 hours. Sin City is a prime example. I read so many things here how great it was. The sound was top notch, the women were top notch, but the movie was brutal. Stupid. wanted 2 hours of my life back. But that's what's so great about burning movies. You don't waste $25, just a buck for a blank DVD-R. My time however is a different matter.