I have watched about 95% of all the TV shows/ Series listed here in this thread, but of them all 24 remains the best. It is a film that you wouldn't like to sleep when watching it and you would love to follow every words and scene in it. Spartacus is also good with wonderful story line, but it is meant for the matured minds. The walking dead is also powerful and i can't wait for season 3 to be out. Other nice ones include, heroes, game of thrones, Pillars of the earth (but very short story line), Avatar, V, e.t.c. The list goes on and on and i believe everyone has their choice.