Caster001: Conjuror
Caster002: Conjuror
Don't double up DPS classes. The buffs don't stack and you end up missing some nice buffs from other classes.

Guardian is the "safe" choice. SK is less durible than the guard, but has higher DPS. SK is an offensive tank while gaurdians are defense.

Troub provide a movement speed buff, you will not be using SOW on a druid.

There's several posts around here somewhere talking about the differences in classes, just look under Noxxy, Frosty or my posts.