Btw, I read the Baldur's Gate manual yesterday, while I was installing it. And I was right, the manual states that you need at least an int of 18 ot memorize spells up to 9th level. Twilights INT of 10 was only enough for 4th level. Now I know the original BG doesn't go higher, but I did assume he'd want to import his char into BG2, and there it would have bombed.
I agree with the fighter assessment, though an STR score of 18/00 would be more desired
What I don't agree with is that wisdom is not necessary. Wisdom modifiers give modifiers to spell saves against mind affecting spells (also stated in said manual), which given the abundance enemy spellcasters throw around charms and holds is not to be belittled.