I still say single-class Spellthief. You're uniquely suited to play it well.
Str: 11, Dex: 15, Con: 14, Int: 14, Wis: 11, Cha: 15
Human (you'll need the Feat & skill points).
Notes on Spellthief:
1/ To steal a spell, you need to either sneak attack a foe who has spells, or touch a willing target. This means you can:
- Steal spells from a distance (no mention of melee sneak attack).
- "Steal" spells from a friend (effectively, unlimited imbue with spell ability for your allies), thus doubling your party's damage output on the first round of combat.
- "Steal" spells from the unconscious Cleric (unconscious counts as willing for effects) to heal him, so he can heal the others.
2/ You can steal anyone's spells. The examples are all arcane spellcasters, but the rules text says nothing about arcane vs. divine. It does mention that you need whatever components the original caster would need, "including Focus", so get yourself Clerical and a Druidic Divine Foci.
3/ The saves are kinda lame, and you don't get Evasion, so consider taking two levels of Monk. If you had enough good scores to pump up your Wisdom, I'd say it's a great choice. Hmm, maybe we can lower your Int score... what skills do we really need? Hmm.
4/ Some Feats from Complete Adventurer:
- Ascetic Mage: see if your DM will allow your Spellthief level to count as 1/2 Sorcerer level, since you cast basically as a Sorcerer. If so, you should certainly take two levels of Monk after eight levels of Spellthief. Oh, and Cha bonus to AC (instead of Wis). Schweeeeet! This would be your 9th level Feat, if your DM buys the half-Sorcerer thing, which is IMHO reasonable. They're from the same book.
- Appraise Magic Value: Like Identify, for 1/4 the cost, without wasting a spell. But you have to already know that the item is magical, which you can do Cha bonus/day after 2nd level.
- Force of Personality: Cha bonus to Will in place of Wis. You have a good Will save, but this wouldn't hurt.
5/ Note that the Spellthief has Speak Language on his skill list. It's just him and the Bard. This is a nifty little perk. Some level, pick up nine languages, just to see the look on your DM's face.
So, a Human Spellthief, level 1:
Feats: Point-Blank Shot, Rapid Shot (use darts or a sling)
Skills: 9*4 skill points, so 9 max'd skills: Concentration, Disable Device, Kn(Arcana), Listen, Open Lock, Search, Spellcraft, Tumble, Use Magic Device
Equipment: Leather armor, Longspear, Sling & bullets
-- N