Spirits of Rage (info, skills, hints and etc.) *may include SPOILERS*

[jWTFz]

I am going to get the full game any day now, and I have trouble choosing what class to play. I mostly like mage in the demo, but I notice that his rage buildup is abysmaly slow, partly because of his modifier, and partly because hardly any enemy survives to reach my troops.

So, a question to all you veterans out there:

Does the mage get enough expirience during the game to learn all the rage spells?

I'd be dissapointed if I did not at leas see those spells, they seem pretty cool.

Additionally, does leveling up Chaos Magic etc change the spells of that school further than just increasing effectiveness?(for example, fireballs gaining a larger area of effect perhaps?).
Are there really massive spells later on to make it worth being a Mage?

Thanks