Just finished part 1 at L3 Wiz / L7 PM. On entry to part 2 I found that many spells I wanted were not for sale, so saved the character and went shopping for spells in another module. Picked up keen edge, enervation, bestow curse and contagion as fitting with the character concept. Just started part 2 with those extras.
The character concept is now to buff up, sneak up on an unsuspecting foe, cast a malicious spell on the target and then beat it up. Animates and summons are now used as decoys to lure minor foes away from bosses. Its quite fun to play in the OC, except I had to cheat to get some extra L3 and L4 spells.
NB, with a +1 int ring and Thayian helm, my IQ is currently 22 (started Elf S14, D16, C11, I17(19), W8, Ch8). I've started taking ghoul touch as its DC is 18 compared with the current undead graft ability with DC 17 (at L7 PM). I can cast the spell from surprise without risking an attack of opportunity and save the class features for when a melee actually starts.