there is no best build. there are builds which are better but the best build doesnt exist. just play what you like and get skilled with it. i play felguard even if it is bugged because i like it much more then any other build
i think the best builds are:
sl/sl
http://wow243.gamestool.net/warlockt.php3500202312231113000002050030133250100501100000000000000000000000
wtf nuke and keep running:
http://wow243.gamestool.net/warlockt.ph ... 0513131000and i play felguard:
http://wow243.gamestool.net/warlockt.ph ... 0000000000i know i dont have Demonic knowledge with felguard because it doesnt work with felguard. i also put 3 points in improved SB cause i play with shadowpriest in 3v3 and its kinda a nice boost to his damage when i crit.
i think some people would go emp corruption but its only 36% and i dont need more damage on corruption. and rogues will CoS it. mage will iceblock. other locks (atleast i do will spellstone)
i use Cor. just for instant dot. nice damage even without the talent, nightfall proc. and keeping rogues out of stealth or let them use CoS
if you are very skilled you can also use Destro for pvp
i would use this build for destro:
http://wow243.gamestool.net/warlockt.ph ... 0513531351i put 4/5 points in aftermath because its 8% chance to daze, and dazing is also interupting!