Talking to my DM, I might end up doing Rogue/Beguiler/Unseen Seer. He seemed a bit bothered by changing to wizard, since it would apparently change my character so much.

However, does Divination Spell Power +1 not actually impairs me? Beguilers have very few divination spells (despite advanced learning). Is this a kind of a drawback? I might try and go the wiz or sorc way if it works the way it seems to do. Mostly wizard, since I don't have to worry about charisma.