Best Spec for PVE

Hi all, i am kinda new in the server (started 2 weeks ago), but i played wotlk when was launched until cata realese in retail, so i have experience with pvp and pve, but i know that in private servers the things are differents. I used to be in a hardcore guild and manage to have light of dawn (almost realm first) with my warlock and playing as affliction. And now i want to know what is best spec for warlock here, i mean the one who does more dps. Cheers!

Its just like in retail. In the beggining Destro > Demo > Affl. But in the Endgame its Affl > Demo > Destro.

Warlocks are usually needed in guilds from my experience. Affliction is the top damage dealer of all 3 specs, however the raid buff demonology provides is superb and most guilds will want you to play as demo, unless they bring 2-3 warlocks.