Dunno, I'm kinda taken with guardian/watchman.
Your skills suffer a little early on, but they pick up before you know it, and you got as many feats as you need.
but the icing on the cake is the sneak attack/force jump combo. That's one hell of an opener, especialy since you can buff up at a safe distance and not worry about the buffs wearing off before you get to striking range.
I've taken three runs through so far, consular/weaponmaster, sentinel/sith lord, and guardian/watchman. And apart from the sentinel/sith lord, who had a bit of a glass jaw, didn't have any problems with any of them.