For the love of all things Holy, DO NOT get the 189!
They are a beefy (read: heavy) ski that is uberfat and rockered...Even Andy Mahre said the 189 Made'n was ridiculous to try'n spin with, and the Hellbent being even bigger will only be worse.  And you don't ski like Andy does either.  At your weight the 189 would more than likely ski you.  Get the 179, which is more like a 185 anyway, and you'll be fine.  The only reason you could/would rock the 189 would be for a huge charging ski, in which case, the Hellbent isn't the right ski for you anyway.