Whats the coolest sounding movie?

T2, still.

The Hit
with John Hurt and Terrance Stamp has very nice acoustical guitar and an excellent movie to boot.

Dead Man
with Johnny Depp has a beautiful soundtrack by Neil Young if you like a haunting electric guitar, this is also a very good (Jim Jarmusch) movie.

I just reread the original post and I am not addressing the question but I will leave these suggestions.

I second Das Boot :)

Saving Private Ryan and Fifth Element.

I agree The Haunting has some great sound effects. For a snippet of fun, check out the video sequence in the extra features section of The Lawnmower Man.

I've got to say T-2 and The Matrix. Never get tired of watching either.