For my combat style, see Starkiller in the Force Unleashed DLCs (discontinuity FTW), except for the reverse saber holding.
He's just brutal. Saber lock? Headbutt the sonuvabitch. Another saber lock? Grab him by the head, throw him in the way of a snowspeeder. Enemy on the ground? Grab him by the leg then throw him against some metal surface.
Generally, I don't really know the seven styles, but I would go with the most agressive one, and combine it with as much Combat Pragmatism as possible. And a lot of brutality.