Netflix Obesession

I have a problem.

And the first step to recovery may be admitting to the fact you know you have a problem, but in this case, admitting it will only make it worse.

I have a Netflix obsession.  The only problem is, I watch all the episodes of a TV show or a movie that was recommended, but once I get to the very end of it, I'm completely lost on where to go from there.  Now, I now I'm not the only one with this problem.  I've seen at least a handful of my personal friends on Facebook asking what to watch next because they just finished watching (insert title here)  and now they're stuck.

This is my personal story of this all-too-familiar pattern:  I watched every episode of The Office (US), then watched all of Portlandia. I've seen all the episodes to date of The Walking Dead, and I've watched a few movies here and there (Battle Royale, Jeff Who Lives at Home) among other random things.

My question is, where do I go from here?  I've been interested in watching the Once Upon a Time series (but Netflix only has one season), have heard great things about Downtown Abbey (even though I haven't a clue what it's about), and have also been recommended Mad Men, Breaking Bad, and Sons of Anarchy.  I'm looking for suggestions, what you loved, what you hated, what you think everyone should be watching but might not be.  Movies are welcome as well, but I've heard a lot of TV shows I've been missing are things I really need to see..