I'm disc/holy atm, mostly disc. I just do the following: Have holy fire/power word: shield on, and then I go down the line of my dmg spells, starting w/ the one that takes the most time, ending with shadow word: pain [instant cast]. Then I wack at the guy until he dies
why in the hell would u want to end a fight with a dot? as a shadow priest u want to shield then pull with vamp embrace if have then hit ur pain spell the dot then mind blast flay mindblast flay and most mobs will be dead