Basic stat values

1 Stamina10 HP
1 Intellect15 MP and 0.0125% crit
80 Intellect1200 MP and 1% crit
1 Resilience~0.0254% crit chance reduction and ~0.051% crit damage taken reduction
39.4 Resilience1% crit chance reduction and 2% crit damage taken reduction

+Damage coefficients

Yes, Improved Fireball and Improved Frostbolt do reduce the amount of +damage applied to the spell. It's not because of the decreased cast time, but it's actually added as part of the talent without being included in the tooltip. :(

The amount of damage added per spell with +50 damage gear is without talents. Any percentage increase in damage through talents will also multiply the +damage added to the spell. For example, with Fire Power, you would get +55 damage to a fireball instead of +50.

Spell NameCoefficient+50 Damage
Fireball100% (90% with Improved Fireball)50 (45)
Scorch42.86%21
Frostbolt81.43% (71.43% with Improved Frostbolt)40 (36)
Fire Blast42.86%21
Ice Lance14.3% (42.86% on frozen)7 (21)