Wayne,
Today, practically none.
If the question were posed in the year 1975 I could think of innumerable sites, but, today, with high tech and the distance issue, what course, architecturally, can challenge the greatest players in the world, be they professional or amateurs.
MeadowBrook certainly comes to mind.
As did Pine Tree and Boca Rio.
But, today, I don't think there are many.
High Tech is narrowing the eligible candidates as we speak.