I'd say take undead because it gives you some toughness and then turns that toughness into condition damage, it also plays off the shaman necklace and jewel which can REALLY be the difference between life and death... and you're right condition (and boon) duration uses addition not multiplication
---------- Post added 2012-07-31 at 11:34 PM ----------
Oh god it was awful if you weren't hiding behind an army of clones like i was lol, you'd be surprised how many people just don't know what to do when you shatter all your clones a few seconds after hitting 3 of them...