This is my DW spec:
http://us.battle.net/wow/en/characte...ryedk/advanced You have a couple different options with your spec choices. You can pick up +45% obliterate damage instead of 30 extra RP, but obliterate is a very situational ability. Most of the time you'll do more damage/pressure by using two howling blasts or necrotic strikes instead of one obliterate, but if you're pressed for globals then obliterate does more burst on cloth/leather. Your other talent choice is to pick up one minute strangulate in the blood tree or desecration in the unholy tree. Howling blast applies chillblains so the only real use for desecration is when you're on druids that are trying to spam shapeshift to get away.
One last note,
DO NOT USE OBLITERATE WITHOUT DISEASES UP. DO NOT USE OBLITERATE UNLESS YOU ARE SURE YOU CAN GET A KILL WITH IT. AND DO NOT USE OBLITERATE EVER IF YOU CHOOSE TO RUN A SPEC WITHOUT THE +45% OBLIT DAMAGE