A hairyHen mix that includes "close the blast doors!" would be my version of the perfect SW mix.
I think opinion on that line depends on one's personal experience. I saw the film in 1977 with mono mix 3 times, and that line (well, the line after it), drew laughs at every showing. I remember when I saw the film in 70mm a month later, I was surprised not to hear the line. And furious when it wasn't on the VHS tape!