A 2-class group: who would you pick?

[Kevin]

I'm high enough level with Bake at the moment (23) to get my Arcane Explosion down to a .3 sec cast time with talents, so last night I went to Redridge to finish up some quests with my wife's priest (21).  It was my first time using the ol' Shield + AE trick, and holy cow was it fun to blow through the "bring me 10 worn battleaxes" quest in 20 minutes! I look forward to much fun using this tactic to bring good times and joy to yours truly.

Anyway, this got me to thinking about what other good class combinations exist. I know some of you have done/do this already (GG & Treesh come to mind), but if your playing time consisted mainly of grouping with 1 other person, what 2 classes would you pick and why?
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What have I played in a duo?

Rogue/druid is a blast. You have healing, tanking or massive single target DPS if you need it. You can stealth to some objectives if you want, you can both easily go AFK. If you don't have a lot of outside support on of you as a leatherworker can keep your gear up to pretty good standards and an alchemist for the other means you have additional niceities, and you can survive an insane amount of stuff with that combo too. Engineering on the rogue would be a fun option too, more AoE damage, and a chance to bring up the druid who is much more likely to die than the rogue.

Warrior/Priest works well. Hard to kill slow to kill anything. Nice for getting a group around you.

Warlock/Mage is a blast. Voidwalker when used right can keep quite a few mobs occupied through some massive AoE damage. Make the mage an engineer and soulstone them. Survivability for 2 "squishies" without healing is pretty damn high. I would recommend one of them be an alchemist for even more healing than just healthstones. This one is insanely fun.

Warrior/Warrior is interesting (on the RP server they are sisters) and playing aggro bounce is interesting.

Warrior/Shaman is more fun than warrior priest, much better killing speed and the healing is just fine for most of the duo stuff.

Hunter/Shaman was very cool. 3 off tanks and lots of ways to swap aggro around them with good killing power. FD and the shaman self rez for really bad situations is quite helpful as well.

Hunter/Priest was alright, but as I will get to, hybrids are better in duos.

For any duo where you want a healer and you don't really need the bubble for AoE goodness I would recommend a druid over a priest for the higher versatility. The druid being able to go cat form and do 80-90% of the damage a same level rogue can do is a big deal and something a priest can't do without a big mana burn. I think I would recommend a paladin over a priest as well for duo situations. A shaman is also the better option for a duo than a priest. The paladin or druid may be a better choice than a warrior in duo situations as well. In general the hybrid classes are more fun in solo and small group situations and offer more options than your specialists. But since they don't distill down as well they aren't as important or fun in the 5 man situations because they become lacking on some key skills. Just some of my quick musings.