If we had warrah DNA, it would probably be the easiest of the animals to clone on the list. Just use a domestic dog as surrogate.
Wouldn't a Maned Wolf work as a Warrah surrogate?
Not an option, but a few from me of species I'd just love to see [spellings will be way off]:
Leptictidium
Indracatherium
Antelodonts
Woolly rhino
Dwarf Sicilian elephant
Giant camel
Titanaboa
One with a bit more potential would be either the Bali or Javan tiger, or the Western black rhinoceros.