Genre: Drama
Title: The Sisters
Comment: Maria Bello, Rip Torn, Tony Goldwyn, Erika Christensen, Mary Stuart Masterson, Elizabeth Banks... based on a similarly titled Chekhov play... this has some really biting dialog, all the way through. Lots of interfamily drama but fun in a really dark way and a little sad. Loved it.
Genre: Political Drama
Title: House of Cards (3 disc/12 episode BBC series from the early 90s)
Comment: Ian Richardson (absolutely love this guy in this) who is a bit of an anti-hero, Machiavellian schemer. If conservatives came as charming, smart and witty as this character, I might actually vote Republican one day for something other than mayor.

But seriously, this is yet another gem I discovered by accident and nearly passed it over because I was way too tired when I first put it on. I loved it so much I bought a set and it remains one of my faves. Dark, quasi satirical political interplay. Fun characters, great dialog as well and lots of dark comedic moments. If you're looking for a little sexual intrigue it's there also. Ian Richardson's asides to the viewer add a bit of a theatrical touch and are deliciously brilliant, always worth a rewind if you miss them. Our politicians are not half as entertaining as this nor, typically, so absolutely articulate.
I also second the Tombstone recommendation. Been years since I saw it though.