Just finished watching Deadwood and can't recommend it highly enough. Incredible acting, dark plot and really rich language riddled with profanity. Ian Mcshane is incredible in it. Even Wu whos English vocabulary is limited to 'cocksucka', 'Swedgin' and 'San Francisco' still cracked me up and Eb Farnam comes out with some crazy, demented monologues while also doing a passable impression of a human Gollum.
Pity there's only 3 series in it.