If you genuinely are concerned with protection, then don't get a skydiving helmet at all. Even a junky bike helmet from walmart has to meet certain standards by law. Skydiving helmets do not.
Look at bmx helmets, snow sport helmets(skiing and snowboarding), paragliding helmets, and maybe a few motocross, though they tend to be too heavy.
You can find full-face helmets in all these categories and the face bar is actually tested as part of the standard.
Base jumpers are more interested in real helmets; check out their forum.