I have to agree with the Kong toys. We have a big chewer also, and she hasn't been able to destroy her Kong toy, OR her Nylabone. In fact, now that I think about it, she plays with the Nylabone more than the Kong toy. I was skeptical about getting the Nylabone because it didn't look like it would feel good in her mouth or be enticing to her, but apparently it is because she loves it. Pay attention to the packages; they'll tell you what kind of chewer the toy is meant for.
Also just the other day, my husband brought home from Walgreens a football-shaped dog toy. It's made of some kind of rubbery material and has a squeaker in it. I thought for sure she would chew it up in no time, but she hasn't been able to tear it. And it only cost $5 :)
Two of the reasons why rawhides are bad for dogs: they can chew off big chunks and either choke on them or swallow them and then have trouble digesting them; and many of them are treated with carcinogens like arsenic. Try a local feed store; they sometimes have treats for dogs that haven't been chemically treated.