I need an addon but it's not exactly DrDamage

[tobindax]

I need an addon that creates a single "benefit number" on the screen, out of Spell Power and Mana Adept of Mage. Ideally, it could put into it the crit chance too for an "average benefit". I know that DrDamage makes some total damage results but

1. Those are not a single number of the screen, they are individual for every single ability.
2. It is very tedious to check in fight since one has to hover over abilities. I need a number on a small alpha window on the screen during fight.

edit: it has to be 'live' of course, based on current values out of procs.