I don't use Aero as I prefer Surecast over the tiny bit of little extra damage Aero gives, but basically, you want CNJ/THM up.

I primarily plat AST. MY cross classes are in this order Cleric Stance, Protect, Swiftcast, Stoneskin, and Surecast.

A lot of people will tell you to class Protect first which is fine, however it is absolutely not necessary at the dungeons before level 20. Just go cleric and help clear the dungeon faster.

On WHM I also use Eye for an Eye and Virus from ACN, which are both pieces of handy utility.