Sorry if this question has been asked before but I couldn't find it if it has.
So I plan on speccing my lock like this soon (http://www.worldofwarcraft.com/info/classes/warlock/talents.html?0500200000000000000002050030133250100531351505000000000000000000)and I was wondering which would be a better choice for the last talent point, 1/3 mana feed or shadowburn. I don't plan on raiding much with my lock and will be using him to mostly pvp and farm mats (probably equal amount). So what do you guys think?