Most any class will work well with a healer.
You could either go with a tank/healer or DPS/healer.
With a healer and a pet clas, the pet can tank while the caster nukes and the healer heals the pet. It's almost like you had a trio.
As far as choice of healer, I would suggest a druid, (warden or fury), because they heal well and also provide the best DPS of any healer so it's kind of like bonus damage for the duo.
I play both a warden and a fury and have done real well as the healer in duos with a guardian - (tank), a ranger - (DPS), and a conjurer - (DPS). I have also had some great duos with another druid - (fury) so you have plenty of good options.
But the bottom line is that both of you should play whatever you think will be fun. This game is so well balanced that any duo can survive and prosper so if you play characters that you like, your immersion will be greater and you will be more likely to stick with the character.
If you just play what someone tells you to there will be no connection and you will likely get bored.
Edited, Sun Mar 12 04:43:47 2006 by OldBlueDragon