I'm getting ready to sign up for cable at my new house, and it looks like the best package that they have with Biography is one that includes two "Premium" channels. I was planning on getting HBO because my wife and I like their original programming. My question is this: do any of the "premium" movie channels ever show movies in letterbox? I'm uninterested in 4x3 pan & scan movies. Should I opt for Starz, Cinemax, or Showtime or does it matter?