Class suggestions for next Duo

So my first foray into multi boxing in WoW was a Fury Warrior and Enhancement Shaman. They've been 70 for almost 2 weeks now and I've even managed to two box both in 2 kara runs. I'll still be using both as my "Mains" and looking for a raiding guild for one or both of them. But I'm thinking of leveling up another pair, preferably not both melee as that is somewhat of a chore. I've been thinking of:

Hunter/Hunter
Mage/Mage
Warlock/Warlock
Mage/Warlock

At first I was leaning towards only mages and warlocks, but lately been getting some nostalgia about my old hunters. Anyone done some or all of these care to comment on their experiences? Any tips?

I did 2, then 3 warlocks and they were a lot of fun... 3 locks took down hogger at lvl 11 :) I only have them at 16 though atm so it isn't much of a recommendation.

How about mage/priest? or lock /priest? nice synergy on that combo

The age-old question is "to do what"?

I have a trio of Druids at the moment, paired up with a duo of Shamans driven by somebody else and I can't think of anything more fun for PvP.

Erm. Actually, I can't think of anything more effective for PvE either. They can all do pretty much everything to a greater or lesser extent.

In your shoes, I'd personally go for a pair of Boomkins - plenty of ranged firepower, adequate tanking, great HoTs, stealth, stealth, stealth... :)

But if I had to choose something from your list, I'd go with Mage + Lock.

The "To Do What" question is answered mailny as to pass time, and add a few options for raid character. Only have a few days of the week that I can play, and am currently trying to find a raiding guild that fits those time. Until then I'm thinking of starting another duo to level up. Little PvE, little PvP. Not really serious on either.

Especially since my battlegroup is horrendous on either side. Kept losing on Horde so we decided to bring our Alliance characters over to PvP on them, and it wasn't much better.

Id say priest and warlock.

A shadowpriest + warlock is the most insane + shadow damage for the lock, and you will nuke anything. And if you go UA then you have dot protection for 2 sets of dots.

Holypriest + warlock is a very high survivability rate and the ability to just dot up 10 mobs and heal through it.
Plus soulstone + rez is a lifesaver.