I would go more heavily into one build, with a twist of something else, and make sure that the 2 callings compliment eachother,
That build will have way too many abilities, and you wouldn't be able to use half of them before the fight is over.
I would make something like this:
Nightblade / Ranger
This compliments eachother alot better.
Heavy melee, and a twist of ranger, with crippling shot, to slow fleeing enemies.
Cause ya' know, you will be beastly, so everyone will be fleeing ;)
And also, with this build you can start building your combo points, from a distance.
"Dusk to dawn" ability is a channeled ability, but will root your enemy in place, awards 1 combo, and 1 additional combo point per sec you channel! So if you get caught with your pants down, ( out of stealth and non to little combo points ) hit this thing, and you should be back in the fight in no time.