I donno I dislike sorc char..
I would go with a pure non-classes wizard (as I did btw)..
Omg the fun this involves.. I gave him like 17 int for starters and man he rocked..
You scout as invisible all the time and fireball groups (btw get extra penetration and +to fire dmg and fireballs are too good to b true
)
Problem is again to get a good amount of XP, but Bozos already gave you the solution so there should be no problems.. I'm now in chapter 5 with a lvl 22 wizzards, almost untouchable.. This rules..