DX because of just the fun I had watching them but I'd have to say the Original 4 Horsemen (Ric Flair, Ole and Arn Anderson, Tully Blanchard, and JJ Dillon as their manager) now because after watching what they did in the NWA, they were gold. Everything they did was good, from their interviews to their matches, they couldn't go wrong.
Honorable Mentions go out to Second City Saints, The Prophecy, The Embassy and Generation Next.