I looked at both 8830 and 8330 when I got mine. I think the Curve is a bit smaller and lighter weight it also has more memory. I do not need international. Camera wasn't a deal breaker, but I do prefer to have it for those occasional times it comes in handy.
I did love the red color of the 8830 and wish they had offered it in the Curve, but I am verrrrrrry happy with my choice.