My vote is for a Shaman and a Monk. Pretty hard to beat. :p

The OP wanted a duo that required some strategy though :rolleyes:

Enchanter/cleric. All the people saying "druid"... ports aren't hard to find :p

If you want fun and strategy, try enchanter + wizard. Two classes renowned for being the first to die in a wipe, one mistake can kill you both, but it was amazingly fun when I tried it.

Bard + shaman is a fun and versatile duo that I have enjoyed.

As a bard, I like to duo w rogue when possible.

A great duo I did recently was my Ench and a Wizard. After my charm pet and mob were both down to <10% health and I broke charm, the Wizard would nuke each one for the kill.

In the meantime I had already charmed and pulled another set of mobs. Having someone else to kill both mobs instead of having to do it myself was a huge time saver and the exp rolled in nicely.

On my Shaman I enjoy duoing with Rogues and Necros.

Shammies tank really well for an evading rogue (or rooted mob ofc) - very underrated :)

warrior / warrior tbph

I said not masochistic!!

Warrior/SK could be fun though. SK barely self heals and warrior never pulls aggro because he's a warrior.