Modern Family, Mad Men and Treme are my big 3 at the moment.
I'm also considering getting The Wire for Christmas since everyone bangs on about it so much, even though the theme doesn't sound very me. (Then again neither did Treme and I LOVE that).
I loved what I saw of Revenge but I'm terrible at keeping track of weekly shows so gave up after about 6 episodes and will invest in the box set.
That's about all in terms of current shows.