I strongly recommend this mod.

[url]http://ui.worldofwar.net/ui.php?id=2394[/url]


You press one button, the mod looks at the targets heal, and level, and your gear, and chooses which level healing spell to use.

For instance, say you are running around a low level friend, and he needs a heal, it will choose say a level 3 healing spell for him, that will use the least amount of mana for you and still fully heal that person.

Or 

Say you  are in UD Strat on the 45 min BullShit run. You are healing a rogue buddy, it might also pick that same level 3 healing spell, because you have uber +to healing gear and your rogue buddy is not that hurt. Regardless, it saves you valuable mana.

Rob