Agree with Lendisa - I know a dark/wind/water sheep, level 28x and she is awesome. With sheep you can make most combos work.
My wind/water/light sheep never got mana arrow/rush or mana ring and she levelled fine (quested up to TM35 and then trained using mana storm). Don't discount AOE first job skills, especially if they are a prereq. Path to oops with storm is a really awesome place to level.
Another good place for aoe sheep to level later on is on ice bears in snow mine, once they have around 1000ma and can ohko (good till around level 320).