I have English style Labradors. They are very calm, but when they begin to play they gather a good jolt of energy. That's expected of course.

I would go with looking into a few breeds.

Labrador, from the proper bloodline.
Greyhound
Clumber Spaniel
Portuguese Water Dog
Standard Poodle
Border Terrier
Cocker Spaniel (either type)

Just remember, long hair does not mean more grooming. It can actually mean less depending on the breed. Good luck on your search.