Im looking to buy one of these but i see theres different once. Can some one tell me whats the difference between them all.

Original
Hd helmet hero
Hd motorstorts hero
Hd surf hero
Hd hero naked
Hd hero 960

Professional
Hd outdoor edition
Hd motorsports edition
Hd surf edition

Are they all the same cam but come with different accessories for different actions?

http://gopro.com/cameras/hd-hero2-outdoor-edition/