Buffy: The Vampire Slayer
What's arguably the best show on television, Buffy: The Vampire Slayer is one of the few shows where the plot takes a backseat to the characters. First-rate dialogue, Emmy award-winning music, and excellent acting. I've very little so far, except for the Bronze VIP Post Archives.

Cupid
Another show with great characters, the tennis-match dialogue between Jeremy Piven and Paula Marshall outshines all others in the banter category. And Paula Marshall is very nice on the eyes.