Everything's pretty much been said. You don't need cha leveling up, and even at 50 you don't need much unless you're charming. You do need tons of mana and hp, encs are the one int caster that gets beat on all the time just as a matter of course.
Cha does affect your likelihood of aggroing a mob if it resists lull, and supposedly has a minor effect on mez landing (I'm not sure on that one), but if you gear all-out cha and try to cap it for regular use you're wasting your slots. Hp and mana!
edit: oh and as someone who usually wears hp gear I have 185 int unbuffed
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