From the limited selection you've offered, and with your stated intention of wreaking world PvP havoc, I would definitely go with Druids. Stealth lets you pick your fights, and they have nifty escape moves that no other class has.

But Alliance PvP without a single tremor totem is going to be painful, so my second choice would be the 4 priest setup. Four fear wards, 4 psychic screams, 4 silences, 4 omni-directional DoTs. Yummy. Squishy, but yummy.