Cunning raises all your damage and healing plus crit chance, stack it. My 50 operative has about 1600 cunning and 1400 endurance (with buffs).
Secondary attributes you want for concealment are crit, power, accuracy, surge (not necessarily in that order).
The pvp stat is expertise, you won't find it on gear until the lvl 40 pvp set (which doesn't have much). Don't worry about this one until you get to 50.