Can you count The Outsiders as one heel? If so they are the best ever bar none.
Hulk Hogan (late 80s early 90s wwf days)
Chris Benoit (circa wcw days best of 7 with booker)
The Texas Tornado
Jake the Snake Roberts
Stone Cold Steve Austin
Mick Foley(pick a persona)
looking back over the entire time when I watched wrestling I would have to add Rick Flair to that list just never appreciated it as a kid.
Gangrel--- if anyone remembers this guy you were a true fan