long post. :/
the perks of the blade dancer subclass for me would focus on offensive and defensive perks.
offensive perks: hungering blade + fast twitch + super = unstoppable force that even chuck norris can't stop. along with switching weapons quickly perk, so you'll be ready anytime. razors edge is a good long ranged attack you can use to wipe out groups in front of you ( i used this when it was archon priest nightfall with arc damage. it was insane against him.)
defensive perks: showstopper, a great way to kill all surrounding you. the invisibility perks are also good. shadowjack + invis perk for super is a deadly ninja that will surprise attack you from anywhere anytime. or just running away from frisky situations.
offense: the extra slide perk along with shotgun is ultimate scum. pair that along with invisibility and you will never have a k/d under 3.0
what i run with: i go with razors edge and hungering blade. useful for taking out groups in the crucible. i can wreck a whole team even though they shot all their firepower if i get the jump on them first. even the titan defender bubble with helm of saint. i can just go in there blind and still take them out. best thing is you regain health after every kill. [b]bad thing is[/b] if they see you first and shoot you from a distance, say bye bye to your super. razors edge is useful for an offensive attack when you can't reach them in time and a great defensive move when the enemy is coming your way. but remember, always activate your super while jumping and around a corner while moving out into the open. it looks cool and you are not a sitting duck when activating your super.
be good bladedancers, and wreck in the crucible
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I use Razor's Edge and Encore. I much prefer Encore over Hungering Blade.