I am a big scifi dork, and one of my favorite shows is BBC's Being Human, which just finished its third season. Now there is also an american version of this show on SyFy, a show they call a SyFy "original," though obviously it is not. The thing that really makes the BBC version a superior show is (a) the writing of Toby Whithouse and (b) the relationship between the actors.
If you haven't seen this show, watch it. If you've seen the SyFy version, give the real original a try, it is a truely fantastic show.