Agreed. I say go with impact resistant if you have the funds. They make the difference.I have worked on only a few homes in flood zones and the walls have to be either break-away or vented as you said you have.
The room area is not considered living area, so I doubt that the windows would have to be tempered or "impact resistant" by code. It might be a good idea depending on the circumstances though, ask your local AHJ.