1.) Darth Vader.  for novelties sake if nothing else.
2.)Darth Revan.  cause hes SO FRICKIN AWESOME!
3.) Darth Nihilus. a "wound in the force" how can he not be in everyones top ten.
4.)Boba Fett.  would be a very good member if he wasnt in here.
5.)Darth Maul.  Didnt have a very big part but what part he did play was epic.
6.)Mandalore the Indomitable.  awesome.  just awesome.
7.)Ordo. 
8.)The Mandalorians in general.
9.)The Sand People.  They kinda remind me of the Fremen.
10.)And last but not least...............Darth Sion.  Oh Yeah!