sure seems to me that neck injury is low on the list.. (unless you are billybusa then a helmet breaks your neck).. I would invest in a back protector myself..
I always wear my helmet, but actually wearing a helmet, is somewhat more dangerous to the neck. Here is why. Usually this is more of a consideration for car drivers, hence the Hans device, but if you hit something, and get a sudden jolt throughout the body, the extra weight on your head from the helmet, gives more momentum to break your neck. Granted you almost always "fly" off you cycle with crashes, there are a lot of weird nanosecond impacts that one does not probably realize.
I would venture to say from what I have seen (Trauma nurse & Paramedic) neck and lower spine injuries are probably third most critical injuries from trauma but when they are injured they are often the most worrisome (though neck is more critical than a back injury). Behind head injuries and hollow organ injuries of course.
I am all about leather and stuff, too. But to me that stuff is just nice to have, as rarely road rash is life threatening. Sure it hurts like )^$#%&, but usually not a big deal. (Yes I have had bad road rash). I used to be an ICU nurse in a large national Burn ICU. We did tons of grafts on cyclists too that would come in with road rash. Painful? yes, Incontinent? yes, time lost at work? yes... but again rarely deadly. Would have to have like 50+ percent rash, down to the muscle to be really getting iffy. Does it happen? yes, people die from infections. Just trying to put it in prospective.
Back on subject, I used a "Neck Pro-Tech" once I think it was called, worked fairly well, but ended up selling it (cant remember why) I think it was geared towards jet ski racers... anyone heard of it?