Grunker
RPG Codex Ghost
Okay, I'm prepared to make a statement: Vanguard >>> Champion once you get Hide (basic) + Jump -> -1 AP cost - -1 CD. That combination is ludicrous. You jump in, kill two things, take 1 step back, hide. Or on a boss, you jump in, strike 2-3 times, take one step back, hide. Crucial affixes are the ones that enable you to hide closer to enemies as well as the one that gives a free escape from AoOs once per turn (so you can get out if you don't kill stuff).
There are also trinkets that can give a free dodge per turn against AoOs, found a blue ring for that.
That's the item I meant with the bolded sentence. Got it on a cloak, a chest and a trophy