So, an Apprentice would be:
Move 6 (0 points) / Fight 0 (0 points) / Shoot -2 (-10 points) / Armor 10 (0 points) / Will +2 (+10 points) / Health 10 (0 points) / Hand Weapon or Staff (+5 points) = 5 points
Therefore, eight spells (3 from Wizard's school, 3 from aligned school, and 2 from neutral school) at a -2 base casting value is set at 195 points.
The Wizard would be:
Move 6 (0 points) / Fight +2 (+20 points) / Shoot 0 (0 points) / Armor 10 (0 points) / Will +4 (+20 points) / Health 14 (+20 points) / Hand Weapon or Staff (+5 points) = 65 points
Wizard's value = 65 + 195 + X (X = value of +2 casting modifier as compared to Apprentice)
= 260 + X
Given that most attribute increases are worth 5 points, each casting modifier bonus would probably be worth 5-10 points. New spells are more difficult, since a character must level up and find/pay for a grimoire. Going with just 5 points in order to be conservative, X would equal 16 (8 spells each with a +2 casting bonus as compared to the Apprentice) x 5 = 30.
Wizard's total starting value = 290 (at least, and probably more!)