Visas has my vote. As someone who has been taught the teachings of the Miraluka and the Sith, and has Force Sight, she has a lot to bring to the table. Plus unlike most Jedi, she has seen and even been forced to partake of evil.
As of 3/14/10, TSL is restored. The Sith Lords Restored Content Modification by Stoney and Zbyl has been finished and can be downloaded here