My favorite is Grayson, but I freely admit to being WAY prejudiced here. I just adore listening to her voice... I could literally imagine her making the New York Telephone Directory a HOOT. I also love her way of pronouncing certain words--"Collinwood" often comes out sounding like "CALLANwood."
Thayer is another favorite because his voice is so distinctive. Humbert was very good, as was John Karlen. Alexandra was excellent, too.
There's a hilarious parody of Louis Edmonds doing a voiceover in the Cheep Productions video, Save Our Cemeteries. When I first saw it, I initially thought it was Louis, but I think it was actually brilliant fan performer Daryl Schaeffer.
G.