[Caravelle1]

at lower levels CC is your biggest challenge.

Myself, I've always personally enjoyed unique setups,

Ench/SK
Ench/Pally

CC is the most valuable thing someone can offer to a group.
clarity combined with these 2 classes allows a means to heal. If you balance the ench pet taking some of the damage and make use of slows the SK or Pally can stay alive.

A less unique and even more powerful combo is

ench/dru
ench/sha
ench/cleric

fighting is very tactical and requires a lot of precision if you want to move around in big dungeons. outdoors there's no problem.
out of the 3 I personally dislike shaman because druid and cleric get both get buffs that stack with the ench HP line

Strongest combo IMO, is Cleric / Ench

Depends on your playstyle but literally any class you want to add to that combo makes a group