Any class with a healer works.
As a Conjurer, I've been a tank - just keep the heals coming. My high DPS and pet beats the mob to the ground.
If the healer draws agro from heals, he just heals himself and becomes a punching bag until the DPS kills the mob.
Fighters = Taunt ability to draw agro, they can take a beating but they have low DPS.
Mages = Weakest armor, but high DPS (except Enchanters).
Scouts = Medium armor, high DPS from behind with poisons + ranged weapon (Rangers have best ranged damage).
Like having pets? Go with Conjurer/Necromancer.
Like Kung Fu? Go Monk.
Like versatility? Go Bard.
Like to sound like hubcaps chained together? Go Paladin.
Like to just blast things into vapor? Go Wizard/Warlock.
No matter what you play, your healer will be able to keep you alive.
If you find you are playing a class that doesn't keep your interest, start a new one and have your Templar friend Mentor you until you are near levels.
Good Luck!
...yes, this is topic #...I forget...of which-class-should-I-be or which-class-is-best...