For PVE I always roll with Gunslinger. My tree is set up for more armor than anything else. I also have the exploding golden gun and long distance golden gun. The throwing knife is pretty useless in PVE (can come in handy sometimes), but I chose the fire DOT skill. Grenades are hit or miss. I think right now I have the tripmine, but I tend to gravitate towards the incendiary.
As far as Bladedancer, I go with a, "Glass Cannon" spec. I have a couple of talents into invisibility (length of all effects and blink strike invis effect) and I have chosen the agility talents over regen/armor. It works really well in Control where you need mobility to get to and from flags and the Bladedancer special can pretty much clear a flag within seconds. For grenades here I chose Arc Grenade, but It's kind of meh.
I'm interested to see what everyone else says!
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Arcbolt is very useful in PvE for clearing out mobs, but the other two grenades suck. I like your setup, I'm playing Bladedancer as well with most of my skills in favour of invisibilty and recovery.
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incendiary is the way to go, possible to clear out some adds.