I have read good things about the Catalyst cases but they seem a bit bulky to me. Here is a link on Best Buy:
Personally, I wear a Case Mate Naked Tough case which has protected my aluminum watch from bumps and scratches on many occasions and has provided plenty of protection. Unfortunately, I have never found a screen protector that I would live with and now I have a few small scratches on my screen. I have a protector that I could put on it but keep putting it off because I just don't like the looks of it.
Also, which watch does your husband have? As you know, if he has a SS version it will be much more durable than the aluminum sport so even if he is hard on it he may not need to cover it with a bulky case because the SS watches are very durable!