I learnt much English via songs and DVDs.
My suggestion, maybe not the answer you wanted, is to connect to the amazon.it site,
and search other there translations of the serials that you enjoyed in the original language.
/friends/ could be great, if you like it, as there is much dialogue.
The same could be said about NYPD (with very well written stories),
or, at a slower pace of dialogue but at a very fast pasce of action '24 hours' (named just '24' in Italy.
What about 'Doc Martin'?
I would say: nice story, well written dialogues, and a not too fast pace.
As you see I don't mention Italian serials, for several reasons.