I agree that you do not want to just give up one your dogs, but what they are doing is not healthy for them either. I can't imagine living in an environment where I may be attacked!
Ulbsterx - You should do what is best for you, your family, and your dogs. Others will give you lots of well-intentioned advice, and some may even make you feel badly about thinking of rehoming one of your dogs, but you should do what is best for you. Our two have fought in the past, and they still tussle about once a year. Situations like yours can be helped sometimes, but not all cases are solvable or even managable (depending on your situation).
I just wanted you to know that we support you no matter what you decide, and that I know you will make whatever decision is best for your family and your dogs.
We had a couple of "trainers" who were unable to help. It wasn't until I hired a behaviorst who traveled over 100 miles to see us that things got better. There is a difference between a behaviorist and a trainer.
Best of luck!!