Loved his intro in "Dirty Girls". The twist where he picks up the potential who is being chased then reveals they are his people chasing her followed by knifing her and dumping her on the road. Now that's how you make an introduction! The combination of being a preacher and working for the first evil is excellent.
Definitely Dirty Girls, if only because the gouging out of Xander's eye is just an epic scene at the level of Greek tragedy. I love how they kept playing it during the 'previously on' in all the following episodes.
Dirty Girls concur. That was a great way to make him look like a threat, Worf out Faith, Buffy and Spike, throw a girl from a car, and destroy Xander's eye. That is how you make someone look like a threat.
Like people in the comments, I choose Dirty Girls, since his first scene in his car, the way he hates women, the way he kills the potentials, he beat Buffy many times like a BigBoss , he's scary as a bad guy, the way this episode ends with his voice over. I'm afraid for the scoobies.