I think you are very lucky and blessed to know that you are both carriers before you go for a baby. As you can imagine there is alot of heartbreak if you find out too late.
Now all you have to do to have a healthy child is go through ivf with pgd. Since 75% of embryos are expected to be healthy ( 50% thal carriers and 25% no thal trait) your chances of finding a healthy one is very good if you have preimplantation genetic diagnosis (PGD) done.
PGD is now available in many places.Find out where it is near you. Best of luck.
Zahra