What are the most needed dps classes on Icecrown?

Hey guys, came back and want to start fresh on Icecrown. Either ally or horde. What's the most needed dps classes?

Demon Warlock, most people prefer Mage CUZ Warlock is too hard for them. But warlock is very very important for all the casters. He can provide more spell power than shaman.

generally dps classes that have some great utility
demolock for raid-wide spellpower, hunter and rogue for tricks of the trade/missdirection, shadowpriest for whatever does that bring in etc.
Those are not exactly the rank one best dps classes. The pure DPS top recount classes are overplayed(too many people) and are wanted in raids but the slots fill up quickly because it's a ton of them.

Also, play alliance if you want to touch voa or pvp

Demo - Boring and powerful raid buff
Shadow priest - Could be more popular, strong raid utility and good dps. Mind Flay will either make it or break it for you.
Balance druid - You're just brez and innervate bot for the most.

Any ranged DPS could be considered "needed". With the exception of Elemental shaman that's really rarely ever needed.