Go for the Savannah view. It's worth it.
If you reserve a standard view room, is it possible you might still have a view of the animals, or should be spring for the additional $70 a night to get Savannah view?
It's well worth the extra money. I almost don't see the point of staying at AKL if you aren't going to book a Savannah view. It was just such an amazing experience to be able to wake up, open your curtains and see the animals. We ate breakfast on our balcony each morning watching the giraffes come in for their breakfast.