Oh god, so many.
Complete series:
Due South
Tour of Duty
Highlander
Starsky & Hutch
Magnificent Seven
Battlestar Galactica (reboot)
Nero Wolfe (A&E series)
Rome
Sports Night
Babylon 5
Monty Python's Flying Circus
Leverage
Almost Human
Common Law
I Claudius
The A-Team
Then I have seasons I like of many other shows: X-Files, M*A*S*H, L&O: CI, Castle, Homicide: LOTS, Hawaii Five-0, plus many more.
Frankly, I have way too many dvds.