If you can, give Dexter a try on the FX Channel. Dexter Morgan is a nice, quiet, polite guy who works for the Miami PD as a forensics specialist in blood spray patterns. He's also a serial killer. But he only kills other killers; the ones who the police are unable to put away. Excellent series; well written, violent, strong performances from all the actors. And, if you're a sick puppy like me, very, very funny.