Personally, I think Bastila has GOT to be Bridget Regan.
She's the only reason I watched that Seeker show. And the whole time I was thinking, gee this chick reminds of someone.... Doh! Bastila! Throw an accent on her and she's perfect.
And I'm thinking Brendan Fraser for Revan (What? He's gotta have a sense of humor!) and Chris Bale for Carth (Angst, brood, angst!) and Ron Perlman is the perfect Canderous.