Originally Posted by Gallo
If Heroics are you ultimate goal (and most PVE 5-boxers it is), then I would highly suggest going Mage,Mage,Lock for the DPS.
2 sheeps and a banish/enslave is probably the best combo of CC for a heroic out of the combinations of mages and warlocks that you can get. Many of the mobs will be sheepable and only a few will be able to be banished or enslaved... this makes an arguement to have more mages than warlocks.
Honestly, you may think that having all of 1 class would be easier for DPSing, but it really isnt. All you're going to be doing is mashing a "DPS" macro button for all 3 anyways. Fireballs and Fireblast for the mages (early on), and shadow bolts and a couple dots for the warlock.
As far as tanks go, I would suggest a Paladin over a druid, just for ease of use. In the later stages (namely heroics) a paladin has better pulling abilities (avenger shield), better AOE tanking ability, and better mitigation than a druid. Not only is the "ease of use" better for a paladin, but his effectiveness is as well.
I'm currently running with a Paladin, Priest, Mage, Mage, Warlock group. Now, I just essentially started, with them all being at lvl 15 (except the lvl 30 paladin whom I already had leveled up), and things seems to be going ok. I've been facing the usual problems that a new boxer faces when going into an instance for the first time.
-my 2 copper