Athena's trainer has owned rottweilers and dobermans at the same time, but dogs are his livelihood. (He runs a security company with his dogs.) He also does not live with 2 males of the same age in the house.
Personally, I don't think the problem lies in the 2 breeds conflicting as the OP's post seems to question, but the problem in having 2 dominant males of the same age (as other posters pointed out).
I don't know your past with dogs and how much you're prepared to handle now. Personally, I find raising one puppy difficult enough, I can't imagine 2.
