It just occurred to me, and bare with me if this has been said, I didn't read every page of this thread, that this may actually be finally the "fist pumping moment" for Alliance. Until now, I was firmly in the vol'jin camp, and wouldn't be surprised if it was him still. This just seems like an opportunity to give Alliance a little love this patch.
My vote in this case is Varian or Anduin, maybe even a father-son tandem thing. It's just too bad this game is rated "T" because I'd love to see a cinematic with Anduin standing over him, drenched in blood.