Created by Joe Weisberg, The Americans is a period drama about the complex marriage of two KGB spies posing as Americans in suburban Washington DC shortly after Ronald Reagan is elected President. The arranged marriage of Phillip (Rhys) and Elizabeth Jennings (Russell), who have two children who know nothing about their parents true identity, grows more passionate and genuine by the day, but is constantly tested by the escalation of the Cold War and the intimate, dangerous and darkly funny relationships they must maintain with a network of spies and informants under their control. Complicating their relationship further is Phillip’s growing sense of affinity for America’s values and way of life. Tensions also heighten upon the arrival of a new neighbor, Stan (Emmerich), an FBI agent working in counter intelligence.
This list is in constant development according to highly rated and reviewed TV shows that I've happened to miss (I was potentially under a rock somewhere). Also, includes up and coming shows that could be firm favourites.