Good luck when you do find the dog you're looking for. I'm sure you'll do great. Personally I don't have any experience with blackmouth curs. I've heard some great things about them and some of the southern hog hunter swear by them. They sure are a neat looking dog.
I have had hounds, mt. curs, feist and a terrier. IMO, a mountain cur is one of the most trainable and adaptable dogs around. Good treeing ability, easy handling (they generally hunt with-in 1/4 mile unless on track and many guys never need to use a leash on them), great pets and in my experience they aren't as hard headed as hounds and terriers. The ones I've had are very sweet dogs. I've never known anyone to use them for blood trailing wounded game and they are generally considered "hot nosed". I know there are guys on this site that use Mt. curs for decoy dogs.
The other dog I might recommend for you is a Jagdterrier. While more hard headed and harder to train. They hunt out farther more like hounds. Mine is very smart and handles well after a couple very short lessons with the e-collar. Lots of hog guys use them and bloodtrailing is one of their specialties. Mine has the best nose I've seen on a dog and that includes any hound I've seen. Mine is very sweet and great with the kids. She's also in the house when ever I'm home and sleeps on our bed on "most" nights /ubbthreads/images/graemlins/wink.gif /ubbthreads/images/graemlins/wink.gif. IMO, They also make better varmit dogs because they are smaller and very quick. Like I said, they are more hard headed.
Don't take any of this as a knock on Blackmouth curs though. Like I said, I've hear some great things about them. But I'm betting it will be easier for you to find a good mountain cur. Fact is, their is just more of them around.
CB