I'm not sure if this has been asked before or if there is anything alike this but I was wondering if there is any addon that could track the mana spent and mana gained back from different sources.
Preferably the sources it should be tracking are the Spellsurge proc, mana gained from Drums of Restoration, mana gained from the shadowpriest(s) in your group, innervating yourself and the mana received from using mana potions.
I know this is asking for quite alot but if anyone could point me in the direction for them, I'd be very thankful.

Since there are certain things which do not show in the combatlog like Innervate and Paladin Buffs this can be a bit tricky. Paladin Buff shouldnt be a Problem but i think Innervate will be somewhat difficult.
Manapots and s-Priest show up in the combatlog so that shouldnt be a problem, but
But theres no AddOn I know doing all that stuff.

I've actually been considering writing an addon like this. Maybe I'll get around to it one of these days seeing as I'm not the only person interested.

Innervate could be done just by checking if you have the buff, and altering how the mana regen ticks are counted.

Would be really awesome, as I'm currently wondering if Spellsurge is really the best enchant for me. Currently I only have WWS stats from one fight, where I'm able to see how much mana I gained through spellsurge. But mainly I just posted this to support you in the idea of making this addon!

Cryect's modified version of Recap would track "power gains".
It may be in Hawksy's version, too.

Also, you might want to have a look at CrepMana.

RegenFu is pretty nice and it has a 5s rule timer built in.

http://www.wowace.com/wiki/FuBar_RegenFu