I'm just browsing through a small book with a few breeds in each group, so there could be a different favorite in some catagories but I don't feel like looking up all the breeds per group. I'm only naming one though there are several breeds in most catagories I like.

Sporting: Golden Retriever

Hound: Basenji

Working: SIBERIAN HUSKY!

Terrier: Miniature schnauzer

Toy: Papillon

Non-sporting: Dalmatian

Herding: German Shepherd

Overall I'd have to say the Working and Herding groups have most of my favorite breeds.