Well, it's highly debatable on whether this would qualify or not, but mid to high content wolfdog. :3 There are actually some breeders who have managed to create their own lines of high content wolfdogs that are, in terms of temperament and trainability, no more difficult than your average dog. I might even get one from one of these breeders someday, when/if my financial and living situation is appropriate for such an animal.
If that doesn't count... I've always had a soft spot for caracals.