what should i do with my elexir

I have a bunch of extra elexir but don't know what to do. I have the troops that I use upgraded to the most. Here are the options I have to upgrade.
Gold storages to 11
Dark elexir drill to level 2
All baracks to healer
Balloons to 4
Healers to 3
Wizards to 4
Dragons to 2
Lightning spell to 4
Heal spell to 4
Rage spell to 2
Thanks please leave your suggestions
:)

Ok if your lab isn't doing anything go for the most used troop, if not I would go for DE drill. once you get it to level 3 it is AWESOME

Rage spell

get all your troops out of the way, although DE and spell upgrades are helpful it is better in the long run to get troops done and over with.