For my tastes, Ricky Jay or Derren Brown.
Ricky Jay has a huge amount of knowledge in his brain, and I really dig his way of conveying that information. His presentation of the Exclusive Coterie is probably the most influential trick I have personally watched.
Derren Brown has a way of seeming both incredibly arrogant and still funny. I know his style annoys or offends a lot of people, but I like it.