We just finished Scourge of Gate Pass, the PCs are about to enter the Forest, they are lvl 3.
I have in my group :
Cleric 3 from a good deity nature oriented
Wizard Illusionist 3
Fighter 3 spécialised in short spear and short sword, he will take lvl in the commander class i think
Fighter1/Wizard 2 Transmuter with trip spécialisation and a guisarme
Rogue 2/Spellthief 1
It is pretty classic (except the spellthief lvl), they are efficient enough.