I think it's great that you are wanting to adopt a deaf dog in need of a good home. I definitely agree that you need to think long and hard about all it will entail before you do it.

It can turn out great though. There's a nice Korean guy who goes to the dog park and he has a Jindo, which is a Korean breed. She is deaf. Rather independent (as Jindos are from what I hear) and she is definitely a bit skittish about other dogs. She's very visual, so if a dog approaches her from behind, she tends to jump away. He has taught her hand signals and she responds very well. She has this thing of tossing her head from side to side...we all wonder why she does this, like how does it relate to her deafness. But on the whole, he has said that he is very happy with her and he wouldn't trade her for a million dollars.