gritsar, those are both great reasons to do it. Another great reason is it is good for your breed. It is more statistical data for this breed, and more information for breeders doing research to plan breedings.
I would encourage you to submit the films on your dog no matter if they look as tho...
Sorry, yes, OFA certainly will evaluate ANY dog with respect to genetic disease, no matter if purebred or papered, or not.
http://www.offa.org/faq.html#3
What BB said.
You need a vet that does a lot of OFA films. If you want, I can ask around on some of my mailing lists for a good person in your area to go to.
You should also have your dog permanently identified in some way. A microchip is fine, so is a tattoo.
Many vets do OFA films with...