In warlords of draenor crit will be the least attractive stat because you will only crit for 1.5x the original number.
Every spreist should have a weapon with elemental force on it for situational use. A single swp with with haste and elemental force will do the most damage but once you start spreading around your dots to lots of people and using mindblast / dp you shouldnt be using ele force.
For example a f2p warrior is running from you trying hopelessly to escape his doom . You know if you cast something on him he will be out of range and gone after one spell cause he is mounted. WORRY NOT . simply equip your haste set and ele force staff then dot the poor bastard and watch as your dot slowly kills him. While you spam emotes at him from affar.
other than that it would be best just to stack intelect.