@Nifft
Nice base class but I think three stats for spellcasting a little bit too much

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@SelcSilverhand
The bonus to retrieved spells might be a good idea. I'll give it a thought.
@Valdrax
Ok thats a good point I neclected. Somehow I was worried that the limitation imposed by "spells retrieved" woul not affect a wizard very much. Now I had a closer look at the Spells per Day table of the wizard class and given that a normal wizard can prepare about 1-7 different spells per level at higher levels the spirit shaman's spellcasting seems to be balanced.
My new wizard is modeled after the Master Specialist (Complete Mage, page 70). Every wizard chooses a "field of expertise" at first level namely one school of magic and gains the "immediate magic" benefit (describedin PHB2 68). This replaces the familiar, which can be aquired through a feat as can a "staff familiar" (described in Dragon 338).
My current (work in progress version) looks like this:
Hit-Die: d4.
BAB: as wizard.
Fort, Ref, Will: as wizard.
Spellcasting: As spirit shaman (Int determines highest spell level, Cha determines DC of spells).
Code:
[b]Lvl[/b] [b]Class Feature[/b]
1 Field of expertise, Scribe Scroll
2 Expanded spellbook
3
4
5 Spell Focus (Field of expertise), expanded spellbook
6 Skill Focus (Knowledge any)
7 Minor school esoterica
8 Expanded spellbook
9 Caster level increase +1 (Field of expertise)
10 Moderate school esoterica
11 Expanded spellbook
12 Caster level increase +2 (Field of expertise)
13 Major school esoterica
14 Expanded spellbook
15 Bonus feat
16
17 Expanded spellbook
18
19
20 Bonus feat, expanded spellbook
Field of Expertise: Choose one school of magic and gain the benefit described in PHB2 page 68. Choose one opposed school (except for Divination). You cast spells from this school at -1 caster level and cannot learn spells from this school when gaining a level.
Scribe Scroll: Bonus Feat
Expanded Spellbook: Choose one spell from your field of expertise and add it to your spellbook without further costs involved.
Spell Focus (Field of Expertise): Gain Spell Focus in the school chosen as your field of expertise.
Minor School Esoterica: see Complete Mage page 70.
Caster level increase: You cast spells from your field of expertise at a higher caster level.
Moderate School Esoterica: see Complete Mage page 71.
Major School Esoterica: see Complete Mage page 71.
Bonus Feat: As wizard bonus feats, but also includes any reserve feat.