Most of the shows we watch are on Sky:
House,
Big Bang Theory (incredibly funny) and we're currently working our way through the box set of
Lost.
Lost is superb, with complex, interweaving story lines and finely drawn characters, plus an outstanding location. If you're wiling to take the time with it, and enjoy complex ScFi, then you will enjoy Lost.
Every so often, US TV comes along with shows that challenge viewers and make them work.
West Wing was one such, and it's in the same stable as Lost. Thinking about, you probably don't need a TV these days; simply buy the box sets of the best of the shows that arrive.