The alternate companion for Lightsiders is Doc . I'd go with 31 points in defence, choosing all skills except Purifying Sweep, Commanding Awe and Freezing Force, with the other 10 points in Vigilance (Saber Mastery, Improved Sundering Strike, Perseverance and Accuracy).
This site here contains a more detailed overview. Just realize that there can be variations on specs to suit your style of game play.