I love:
Comedy:
That 70's Show (seasons 1-6, not the last one!)
30 Rock - funny, American comedy that takes the piss out of everyone!
Friends - Classic American comedy
Outnumbered - British comedy, earlier seasons really funny with ad-lib kids
Drama:
CSI (Vegas only, seasons 1-10)
The West Wing - Martin Sheen as the President we all want!
The Sopranos - Classic, brilliant and well-acted
Mad Men - Advertising in 1960s, very cool (just bought the box set)
(am a transplanted American, but watch CSI, Judge Judy (!) and documentaries (which I can recommend if you like as well!)
best wishes