Rhinemaiden
Tarot for Cats - Kipling West (it's a majors only deck, comes in a boxed set with a charming book)
http://www.aeclectic.net/tarot/cards/tarot-for-cats/
http://www.aeclectic.net/tarot/cards/tarot-for-cats/
Oracles -- and cuteness -- are very welcome here!
Like this, my one cat oracle deck (so far): Cat Comfort Cards
http://www.janetboyer.com/Cat_Comfort_Cards.html (scroll down)
(As you see, cat puns are also welcome!)
It's a tie between the Baroque Bohemian cats and the Mystical. cats Both fabulous but so very different. Wow, this is a difficult question... Can't choose!