i would say Ivey or Brunson are the best all-around players.
All the best current players play each other all the time at Full Tilt. Ivey, Townsend and Antonius are pretty much afraid of nobody in hold em and play eachother HU from time to time but they prefer to play weaker players. One of the three is probably the best NL holdem player in the world today but tough to say which one.