L.N.
i don't know about hearing implants, but if you're dealing with inner ear specialist i would get his/her opinion. we may be dealing with the same choice in the future and honestly what people think or will think is the last thing on my mind. don't forget your son has one ear with complete deafness that means he will hear with the otehr ear which will help him process language. what he will also be dealing is background noise, while trying to process language. hearing aids, therefore, hearing implants are means to lessen this problem. also, there is an equipment you can get for him for classroom (hopefully for free through your school district) that isolates background noise for him. i am just running a blank right now on what's it's called, but something like FM system, like a radio transmitter that has a microphone hooked on the teacher with receiver at his end. that way he will solely be listening to the teacher while not being distracted by background noise.
as for BAHA implants, again, i haven't started my research yet, but get recommendations about what's the best in the market right now, now what will other kids say to him.
good luck