I'ts actually here:
http://www.youtube.com/watch?v=DSRA4dkFrhc
I guess everyone has his own favorite phrase.
You know you can't remove from your head the
"You must construct additional pylons!"
Yet these are my favorite phrases:
"You've persecuted us for generations, and now you beg us to aid you?
We will do what we must, but we do it for Aiur, not you."
"All I see is an abomination"
(Zeratul to Duran. Actually all the dialogue between Duran and Zeratul in Dark Origin.)
EDIT
Z-"By the Gods, this can't be happening"
"No..."
D-"Magnificent, isn't it?"
Z-"What? Who are you?"
D-"I'm a servant of a far greater power"
[...]
D-"And when they do, your universe will be changed... forever"
Ahhm, just watch it here.
http://www.youtube.com/watch?v=2iQ89fr1ROc