I've trying to not stance dance as much as possible... with the right aura's in defensive stance, the Dark Templar can be a pretty impenetrable fortress. Not only is damage cut down, but you're recovering most of what the enemy is whacking you for with a few simple draining skills. It's great.
Although, one downside to the Dark Templar, these higher level combo's have huge cooldowns... we're talking 45 seconds for some. But, its easily equated by using some lower level combos imbetween cooldowns that can cause a bit of damage.
Also, the feat allowing me to get stamina from drains... coolest, and most useful, fucking thing EVER.
Definitely doing Dark Templar for my first launch build.