Perry Mason, the original. That might be my favorite tv series of all time. Perfectly cast, and all the shows are just right. The only thing, is it could have used more episodes with Ray Collins in it, as Lt Tragg. The actor was getting towards the end of his life, and having issues though.
Home Improvement
Magnum PI (original)
Andy Griffith
Seinfeld
M*A*S*H
Older Modern Marvels (not too old, er "classic", but getting there)
Tales of Wells Fargo/Gunsmoke/Bonanza/Virginian (gotta love Westerns!)