I can't pick just five.
Sanford and son
Hawaii 5-0 ( new series )
Law and order- reg and svu
Remington Steele. Gosh I loved pierce brosnan at the time.
Murder she wrote
I could go on. But I love all these shows. Really
The Good Wife
Seinfeld (although I missed original air and loved the reruns)
Only Fools and Horses
Pride and Prejudice
La Piovra (Italian show)
Heartbreak High (Australian Show)
Classics -> Frasier, Seinfeld, The Sopranos, Friends, and... hmm.. not really a classic but I absolutely love Monk.
Other shows I liked -> Cheers (I just loved Frasier more), South Park (started out amazing...), Twin Peaks (too short to count, but I loved it), Beverly Hills 90210 (I don't even remember if it was any good, I just remember I always watched it with my sibs so I associate strong fond feelings with that show), Mad Men (has had at least one dud season.. and it's getting a little more soap opera than I'd like), Psych (I just love Monk more)