I'be been looking at hand bikes and i've seen them low to the ground or more high up. I'm looking for any advice on which would be the best for my husband who is a c-5. I think this is something we could do as a family again and he now wants to loose weight(say's he feels like a shlub). Any help would be great.

Being that he is a c5 you are going to want to look at the more reclined versions, try bike-on.com they have some really good info and have a used bike section

Try looking online for some handcycling clinics somewhere near you....I have a website link somewhere, so I'll try to find he. These clinics will allow you two to go and try a few different bikes......