250, I agree with. Well, to a point anyway.
My favorite character in BG2 is Edwin. He's a conjurer. He's a fairly high level(15), so he can summon some mean monsters. I've been noticing some of the weeknesses you've mentioned. That's why I think Edwin rocks. He mostly summons stuff, like cacofiends, Djinns and other mean guys. Of couse Edwin still hastes and what not, but that's not his speciality.
Conjurers rock.
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