Kreia all the way, She is definately darkside but I did not really see her as 'Sith', as she says to Atris about Sith teachings:-
"There is no truth there, but it is a step in the right direction".
Well it was something like that anyway. Seems to me she meant it as a step in embracing a wider view of everything.
As for the previous post about Jedi not being manipulative, hang on a bit. Jedi are completely manipulative, it may be for what they consider the greater good but what that boils down to is 'the end justifies the means'.
It all comes down to your own point of view, as said by Obi Wan himself.