My group came out really good for my Eberron game.
Human Fighter (Melee/Tank)
Human Cleric (Healing)
Halfling Artificer (Booster/Traps)
Human Wizard (Blaster)
Half-elf Rogue (Traps/sneak)
Warforged Fighter/Cleric (Melee/Tank/Healing)
I have two warriors as needed, a priest and a backup priest, two warforged healers, a blaster (esp thanks to reverse feats), a sneak, and two trapfinders. So far, they're doing good, but they are only 3rd level...
Still everyone manages to fill a role or two. In a few levels, they will be totally self-sufficient as a group.
The Artificer also doubles as a back-up healer if necessary.
