Jay at 2010-11-08 23:31:57:

Prisoner of Azkaban.

Marc at 2010-11-09 02:24:00:

ditto
(heaven't seen part 6)

RonC at 2010-11-09 09:51:53:

J.K. deserves every penny. Those 7 books were truly one of the great reading experiences of my life.