Try Boardwalk Empire and Homeland mate, I also hear Masters of Sex is good so far.
Another brilliant one is The Americans, though it's not due again until next year.
Yesterday's episode of Homeland is right there among the best episodes of television series I've ever watched. God f-ing amazing!!!!!!
Homeland is so shit now. First season was amazing. After that it got unrealistic, too mushy (with Carrie and Brody), and 24-esque. Still watch it though...