Zerker/Knight
I stacked more vitality and toughness at first, and as time went on replaced piece by piece with zerker as i got better at surviving. At this point i use nothing but zerkers, scholar runes, crit% sigil on weapon. So basically my suggestion is only stack as much vit as you find you need to survive, and taper it off as you become more skilled. I very rarely get downed with full glass cannon. But keep tha vit gear around, as its always helpful in some of the boss fights, and wvw especially