4.3 Rerolling on KJ need a 4x

[Meshuggenah]

I would second the suggestion for DK's, if you're planning on PvPing a lot.

For PvE, though, especially if you're planning on trying to multibox raids, I'd suggest any ranged DPS over melee. Hunters are a good choice. As long as you have all the core buffs/debuffs covered, you can never really have too many Hunters in a raid. They've got so much utility. They also don't have much competition for MS loot, except for the shared items like trinkets, cloaks and jewelery. Agility mail and bows always end up being DE'd in our raids.

Priests don't have the utility of Shamans, but for purely BG usage, I've always been curious to give 4x shadow priests a try. Especially next expansion with the new Vampiric Dominance talent.